Sienna Miller Age spent more than two decades building a career that reaches well beyond the glamorous image that first made her famous. Born on December 28, 1981, the American-British actress, model, and fashion figure is 44 years old in 2026. From early modeling work and breakthrough films such as Layer Cake and Alfie to acclaimed performances in Factory Girl, American Sniper, Anatomy of a Scandal, and Horizon, Miller has continually reinvented herself. Her story also includes motherhood, fashion influence, theater, producing, and a remarkable second chapter in Hollywood.
Quick Bio of Sienna Miller
| Category | Details |
|---|---|
| Full Name | Sienna Rose Diana Miller |
| Date of Birth | December 28, 1981 |
| Age | Sienna Miller Age is 44 years old in 2026 |
| Birthplace | New York City, New York, USA |
| Nationality | American-British |
| Profession | Actress, Model, Fashion Designer, Producer |
| Years Active | 1999–present |
| Best Known For | Layer Cake, Alfie, Factory Girl, American Sniper, Anatomy of a Scandal |
| Parents | Edwin Miller and Josephine Miller |
| Sister | Savannah Miller |
| Education | Heathfield School; Lee Strasberg Theatre and Film Institute |
| Height | Approximately 5 ft 5 in (1.65 m) |
| Children | Three |
| Partner | Oli Green |
| Famous Style | Boho-chic / relaxed fashion |
| Fashion Label | Twenty8Twelve |
| Estimated Net Worth | Around $18 million, according to older public estimates |
| Current Career | Film, television, fashion and producing & MORE |
Sienna Miller was born in New York City but was raised primarily in London after moving there with her family when she was about 18 months old. Her British and American background has remained an important part of her identity and career.
Who Is Sienna Miller?
Sienna Miller is an American-British actress who became widely known in the early 2000s through a combination of modeling, film, fashion, and highly publicized celebrity relationships.
Her acting breakthrough arrived in 2004 with Layer Cake and Alfie. She subsequently played Edie Sedgwick in Factory Girl, appeared in Casanova, Stardust, The Edge of Love, and G.I. Joe: The Rise of Cobra, and later developed a more serious dramatic reputation through projects including Foxcatcher, American Sniper, The Lost City of Z, The Loudest Voice, and Anatomy of a Scandal.
What makes Miller particularly interesting is the evolution of her public image. In the middle of the 2000s, she was frequently discussed as much for her fashion and private life as for her acting. Over time, however, she deliberately moved toward more demanding roles and established herself as a respected performer.
Her own reflections on turning 40 captured this transformation. While discussing Anatomy of a Scandal, Miller said that getting older felt less like doors closing and more like opportunities opening.
Net Worth
Sienna Miller’s net worth is commonly estimated at approximately $18 million, although this number comes from older public estimates and should not be treated as a verified financial statement. Celebrity net-worth figures are rarely based on complete public records and can vary considerably between publications. An older estimate published by Tuko, for example, placed her net worth at $18 million in 2022.
Her wealth has been built through several different areas rather than acting alone.
Acting Income
Miller’s principal source of income has been her acting career.
Her filmography includes commercially visible productions such as G.I. Joe: The Rise of Cobra and American Sniper, alongside independent and prestige projects. She has also appeared in television productions and streaming series, giving her career multiple income streams.
Modeling and Fashion
Before becoming a major film actress, Miller worked as a model. She appeared in Italian Vogue and was featured in the 2003 Pirelli Calendar. Her fashion reputation later became an important part of her commercial appeal.
In 2007, she and her sister Savannah launched the fashion label Twenty8Twelve, backed by Pepe Jeans. The brand name referenced Miller’s birth date, December 28.
Producing
Miller has also moved behind the camera. In 2024, she joined the short film Marion as an executive producer, demonstrating that her professional ambitions extend beyond performing.
Because exact contracts and private investments are not public, it is more responsible to describe her net worth as an estimate rather than present a specific figure as fact.
Personal Life
Sienna Miller’s personal life has been a major part of the media narrative surrounding her, particularly during the early years of her fame.
Her relationship with actor Jude Law became highly publicized after the two worked together on Alfie. They became engaged in 2004, but their relationship ended after a difficult period of intense media attention. They later briefly rekindled their romance before separating again in 2011.
Miller later entered a relationship with actor Tom Sturridge. The couple became engaged and welcomed their daughter Marlowe in 2012. Although their relationship ended, they have continued to share parental responsibilities.
In the early 2020s, Miller began a relationship with actor and model Oli Green. Their relationship attracted attention partly because of their age difference, something Miller has discussed openly.
By June 2026, People reported that Miller and Green were engaged and had welcomed their second child together. Miller also has her older daughter Marlowe from her previous relationship with Sturridge.
Miller’s personal life has therefore entered a very different chapter from the tabloid-heavy years of her early fame. She is now balancing motherhood, family life, and an established professional career.
Professional Life
Miller’s professional career began with modeling and smaller acting opportunities before she moved into increasingly prominent film roles.
Early Acting Career
Her screen career began around the turn of the millennium. She appeared in projects such as South Kensington, High Speed, The Ride, The American Embassy, and Bedtime. She also had a regular role in the television series Keen Eddie.
These early roles gave her experience before she entered the international spotlight.
Layer Cake and Alfie
The year 2004 became a crucial turning point.
Miller appeared opposite Daniel Craig in Layer Cake, followed by Alfie with Jude Law. These films established her as a recognizable young actress and placed her firmly within the British and international entertainment industries.
The visibility from these projects also transformed her fashion profile.
Factory Girl
In 2006, Miller took on one of her most demanding early roles: Edie Sedgwick in Factory Girl.
Playing the 1960s socialite and Andy Warhol muse required her to portray a real historical figure rather than a conventional fictional character. The role helped demonstrate that she was interested in more than commercial romantic comedies.
Theater Career
Miller also developed a significant theater career.
She made her West End debut in As You Like It in 2005. In 2009, she appeared on Broadway in Patrick Marber’s After Miss Julie, a project she had long wanted to undertake. She later returned to London’s West End for productions including Flare Path and Cat on a Hot Tin Roof.
Theater provided an important counterbalance to the intense celebrity attention surrounding her film career.
American Sniper and Later Films
Miller continued building her filmography through the 2010s.
Her notable credits include Foxcatcher, American Sniper, The Lost City of Z, Live by Night, and American Woman. These projects allowed her to work with established filmmakers and actors while taking on increasingly varied characters.
The Loudest Voice
In 2019, Miller appeared in the Showtime miniseries The Loudest Voice, playing Beth Ailes opposite Russell Crowe.
The role required substantial research because there was relatively limited publicly available footage of Beth Ailes. Miller explained that she relied on the script, the source material, and the small amount of footage she could locate.
Anatomy of a Scandal
Miller reached a new television audience through Netflix’s Anatomy of a Scandal in 2022.
She played Sophie Whitehouse, a woman whose apparently privileged life begins to unravel following revelations about her husband. Miller described the character’s journey as one of self-discovery and questioning her own complicity.
The role also became significant in discussions about women, privilege, consent, and changing expectations around relationships.
Horizon: An American Saga
Miller appeared in Kevin Costner’s ambitious Western project Horizon: An American Saga, playing Frances.
Costner praised Miller’s ability to bring nuance and believability to her characters, while Miller described Frances as a woman whose resilience is shaped by devastating loss.
Jack Ryan Movie
Miller was also announced for a Jack Ryan feature film starring John Krasinski. According to Skydance, she is set to play an MI6 agent, essentially a British counterpart to Krasinski’s Jack Ryan.
The project represents another opportunity for Miller to work within a large-scale action franchise while retaining the dramatic credibility she has developed over the years.
Height and Physical Appearance
Sienna Miller is commonly listed at approximately 5 feet 5 inches (1.65 meters). IMDb lists her height as 5’5″.
She has long been recognized for her blonde hair, blue eyes, natural-looking makeup, and relaxed approach to fashion.
However, her influence on appearance and style goes beyond conventional celebrity beauty.
During the 2000s, Miller became one of the defining faces of the “boho chic” movement. Her flowing dresses, boots, layered jewelry, loose hairstyles, and casual festival looks became highly influential.
British Vogue described her as a major figure in the bohemian fashion movement alongside Kate Moss.
In 2026, Vogue continued to describe Miller as an enduring face of the boho aesthetic, noting how her Glastonbury looks and 1970s-inspired clothing continue to circulate as fashion inspiration.
Children
Sienna Miller is a mother of three children.
Her first child, daughter Marlowe, was born in July 2012 during Miller’s relationship with actor Tom Sturridge.
Miller later had two children with Oli Green. Their first child together was born in early 2024. In 2026, the couple welcomed another child. Public reporting has indicated that details about the newest baby’s name and sex have not been fully disclosed.
Motherhood has become an increasingly visible part of Miller’s life, but she has continued to work professionally.
Her perspective on becoming a mother later in her career has also challenged some of the older assumptions surrounding women in Hollywood.
Early Life and Background
Sienna Rose Diana Miller was born on December 28, 1981, in New York City.
Her father, Edwin Miller, was an American banker who later became a dealer in Chinese art. Her mother, Josephine, was a former model born in South Africa to British parents. Josephine also worked as a personal assistant to David Bowie and later managed the Lee Strasberg Theatre and Film Institute.
Miller’s family moved to London when she was approximately 18 months old.
Her upbringing therefore combined American and British cultural influences. She grew up surrounded by creative people and developed an interest in acting early.
An especially unusual detail about her birth is that her mother went into labor while attending a performance of The Nutcracker in New York. Miller was therefore nearly born inside a theater.
That detail seems almost symbolic considering the career she would eventually build.
The Story Of Success
Sienna Miller’s success is best understood as a story of reinvention.
Her first public image was strongly connected to fashion. She was young, beautiful, stylish, and suddenly everywhere.
Then came the tabloid era.
Her relationship with Jude Law brought extraordinary attention, and the constant focus on her private life sometimes overshadowed her acting. Later, Miller became involved in the British phone-hacking scandal and received damages after News of the World admitted hacking her phone. She subsequently gave evidence to the Leveson Inquiry.
Instead of allowing that period to permanently define her, Miller changed direction.
She stepped away from film for periods and concentrated on theater. She took challenging roles. She worked with respected directors. She embraced characters that were considerably removed from the fashion persona associated with her early career.
That transformation is one of the most compelling aspects of her professional story.
Her career demonstrates that fame and credibility are not always the same thing. Miller had fame very early, but she spent years building the deeper professional reputation she wanted.
By the time she reached projects such as The Loudest Voice, Anatomy of a Scandal, and Horizon, she was increasingly being discussed for her acting rather than her relationships or clothing. Vanity Fair specifically noted her desire to be recognized for her work rather than her personal life.
Education
Miller attended Heathfield School in Ascot, Berkshire.
She later studied drama at the Lee Strasberg Theatre and Film Institute in New York. A Cannes Film Festival biography also records that she was educated in England and studied drama at the Lee Strasberg Institute.
Her education was therefore strongly connected to performance.
Rather than relying exclusively on her appearance or modeling opportunities, Miller pursued acting training and gradually developed the technical foundation for a long-term career.
Her later theater work particularly demonstrates the importance of that training.
Personal Style and Lifestyle
Few actresses have had their personal style become as influential as Sienna Miller’s.
Her early-2000s wardrobe helped popularize boho chic among mainstream audiences. Loose dresses, vintage-inspired pieces, boots, oversized sunglasses, and casual festival clothing became strongly associated with her public image.
Her influence was not limited to magazines. Fans regularly recreated her outfits, while fashion editors continued referencing her looks years later.
British Vogue has continued to describe Miller as an enduring style influence, particularly around festival fashion and 1970s-inspired silhouettes.
Interestingly, Miller has never appeared to treat fashion as a rigid formula. Her style has evolved from bohemian festival looks to sophisticated tailoring, elegant eveningwear, and more mature contemporary fashion.
Fashion Design
Her interest in fashion eventually became a business venture.
In 2007, Miller and her sister Savannah launched Twenty8Twelve, a clothing label backed by Pepe Jeans.
The project demonstrated that her relationship with fashion was more than celebrity endorsement. She was interested in participating in the design and business side of the industry.
Beauty and Aging
Miller’s approach to aging has also become part of her modern public image.
In a 2026 British Vogue feature, she discussed beauty, aging, hair, and pregnancy while representing Schwarzkopf’s Crème Supreme. The article emphasized that her beauty identity has evolved rather than remained fixed in the image she had during the 2000s.
This reflects a broader shift in celebrity culture: rather than trying to preserve a permanently youthful image, Miller has increasingly embraced different stages of adulthood.
Sienna Miller and TikTok
The phrase “TikTok career” requires some clarification.
Sienna Miller is not primarily known as a TikTok creator with a traditional influencer career. Her TikTok relevance is largely connected to viral fashion clips, interviews, red-carpet moments, beauty content, and fan edits.
In 2026, British Vogue noted that Miller embodies some of TikTok’s popular beauty trends, particularly the contrast between high-maintenance beauty routines and an effortless-looking result.
Her fashion influence also gives her a strong presence in short-form social-media culture. Old photographs, Glastonbury outfits, hairstyle references, and interviews are frequently repackaged for younger audiences.
This means that her influence has survived beyond the generation that originally made her famous.
Rather than building her career through TikTok itself, Miller has become a subject of TikTok culture.
That distinction is important.
Sienna Miller’s Wikipedia Profile
Sienna Miller’s Wikipedia profile identifies her as an American-British actress born in New York City on December 28, 1981. It records her career beginning in the late 1990s and continuing into the present.
The profile covers her early modeling work, acting breakthrough, filmography, theater performances, fashion work, relationships, children, and legal battles involving media intrusion.
For general biographical information, Wikipedia is a useful starting point. However, individual facts—particularly current relationship developments, net worth estimates, and new projects—are better checked against current primary or reputable news sources.
This is especially relevant for Miller because her personal and professional circumstances have changed considerably in recent years.
Awards and Recognition
Miller’s career has received recognition across film, television, theater, and fashion.
Her portrayal of Tippi Hedren in the television film The Girl earned her nominations for a BAFTA Television Award and a Golden Globe.
She was also nominated for the BAFTA Rising Star Award in 2008, reflecting the industry’s recognition of her early potential.
Her selection for the main competition jury at the 2015 Cannes Film Festival was another significant professional honor.
Although she has not built her reputation around collecting large numbers of major acting trophies, her career has consistently received critical and industry attention.
Why Sienna Miller’s Career Remains Relevant
Miller’s career has lasted because she has repeatedly changed with the industry.
She entered entertainment during the era of celebrity magazines and paparazzi culture.
She survived the transition to digital media.
She moved between film, television, theater, fashion, and production.
She has also entered an era where older actresses are increasingly demanding more complex and substantial roles.
Her comments about turning 40 are particularly revealing. Rather than viewing age as a limitation, she described that stage of life as an exciting period in which she felt clearer about her abilities, interests, and ambitions.
That attitude may be one of the most important explanations for her longevity.
Final Word
Sienna Miller’s story is far more complicated—and far more interesting—than a simple celebrity biography.
At 44 years old in 2026, she has already lived through several distinct professional eras: model, rising actress, fashion icon, tabloid celebrity, theater performer, respected dramatic actress, producer, designer, and mother.
Her breakthrough in Layer Cake and Alfie made her famous, while roles in Factory Girl, Foxcatcher, American Sniper, The Lost City of Z, The Loudest Voice, Anatomy of a Scandal, and Horizon helped establish her acting credentials.
Her estimated net worth of around $18 million is widely repeated but should be regarded as an approximate figure rather than a verified account of her finances.
Her personal life has also entered a new chapter. She is now a mother of three and, according to 2026 reporting, engaged to Oli Green.
Perhaps most importantly, Miller has gradually shifted public attention away from the tabloid stories that once dominated coverage of her and toward her work.
That is ultimately the strongest measure of her success.
She entered Hollywood as a young actress surrounded by enormous attention. More than two decades later, she remains active, versatile, stylish, and professionally ambitious. Her story is not simply about becoming famous—it is about surviving fame, growing beyond it, and creating a second chapter on her own terms.
FAQS
How old is Sienna Miller?
Sienna Miller was born on December 28, 1981. She is 44 years old in 2026.
When was Sienna Miller born?
She was born on December 28, 1981, in New York City, United States.
What is Sienna Miller famous for?
She is known for films including Layer Cake, Alfie, Factory Girl, The Edge of Love, American Sniper, The Lost City of Z, and Horizon, as well as television projects such as The Girl, The Loudest Voice, and Anatomy of a Scandal.
What is Sienna Miller’s net worth?
Public estimates have placed her net worth at approximately $18 million, although no independently verified public financial statement establishes an exact figure.
Is Sienna Miller British or American?
She is both American and British. She was born in New York City and raised primarily in London after moving to England as a young child.
How tall is Sienna Miller?
Sienna Miller is commonly listed at approximately 5 feet 5 inches (1.65 meters).
Does Sienna Miller have children?
Yes. She has three children. Her eldest daughter, Marlowe, was born in 2012, and she has two younger children with Oli Green.
Who is Sienna Miller’s partner?
Sienna Miller is engaged to actor and model Oli Green, according to 2026 reporting.
What happened between Sienna Miller and Jude Law?
Miller and Jude Law became engaged after meeting while working on Alfie. Their relationship ended after a highly publicized period, although they later briefly reconciled before separating again.
Did Sienna Miller work as a model?
Yes. Before becoming a major actress, Miller worked as a model and appeared in publications including Italian Vogue and the 2003 Pirelli Calendar.
Did Sienna Miller have a fashion brand?
Yes. In 2007, she and her sister Savannah launched the fashion label Twenty8Twelve, backed by Pepe Jeans.
Why is Sienna Miller associated with boho fashion?
Her relaxed clothing, flowing dresses, boots, festival looks, loose hairstyles, and vintage-inspired styling made her one of the defining faces of 2000s “boho chic.” British Vogue continues to identify her as an important influence on the aesthetic.
Is Sienna Miller a TikTok star?
Not in the traditional sense. She is not primarily known for building a career as a TikTok creator. Instead, her fashion, beauty, interviews, and older celebrity moments circulate widely through TikTok and other short-form platforms.
What is Sienna Miller’s most recent major work?
Miller appeared in Kevin Costner’s Horizon: An American Saga and has also been attached to the upcoming Jack Ryan feature film, in which she is set to play an MI6 agent opposite John Krasinski.
What did Sienna Miller study?
She attended Heathfield School in England and later studied drama at the Lee Strasberg Theatre and Film Institute in New York.
Why did Sienna Miller take a break from acting?
After the intense attention surrounding her early fame, Miller stepped away from film for periods and concentrated on theater. She later explained that she had become frustrated with the perception surrounding her and wanted to focus more seriously on acting.
What makes Sienna Miller’s career successful?
Her longevity comes from versatility and reinvention. She has worked in mainstream film, independent cinema, television, theater, fashion, and producing, while gradually shifting public attention from her private life toward her professional work.
