Who Is Sienna Miller? Movies, Age, Personal Life

Author Note: Written by a film and entertainment journalist with over 10 years covering British cinema, celebrity culture, and fashion history. All details verified through published interviews, IMDb records, and credible entertainment sources.

Introduction

You’ve seen her on red carpets, on Netflix, and across two decades of film posters. But most articles about Sienna Miller barely go past the headlines. If you’re searching for her age, her best films, her relationship history, or why her hair became a cultural moment — this guide covers all of it. No fluff. No filler. Just the full picture, organized and easy to follow in under 10 minutes.

Sienna Miller: Quick Reference Table

How Old Is Sienna Miller?

Sienna Miller was born on December 28, 1981, which makes her 43 years old in 2025. She holds dual British-American nationality — born in New York City and raised primarily in London. That split upbringing shaped her distinctly transatlantic personality, making her equally at home in Hollywood productions and British indie films.

She attended the Lee Strasberg Theatre Institute in New York before returning to the UK to pursue acting seriously. Her birthday falls just after Christmas, a detail she has mentioned in interviews as making childhood celebrations feel slightly blended.

Sienna Miller’s Early Life and Modelling Career

Before her first film credit appeared, Sienna Miller had already built quiet recognition as a model. She signed with Storm Model Management in London during her late teens — the same agency responsible for launching Kate Moss’s career. Her look was specific: expressive eyes, natural bone structure, and a relaxed confidence that photographers responded to immediately.

Her modelling career included work for Coca-Cola, Pepe Jeans London, and editorial features in Vogue UK and Elle. These weren’t just cheque-cashing jobs — they trained her eye for image-making and gave her a camera presence that translated directly into her later performances.

Sienna Miller’s modelling background is rarely discussed in depth, but it explains a great deal about her onscreen composure. She understood angles, timing, and visual storytelling before most of her film contemporaries learned them through years of auditions.

Sienna Miller Movies and TV Shows: Full Career Timeline

Sienna Miller’s screen career began in the early 2000s and has never stalled — it has only deepened. She has appeared in mainstream Hollywood tentpoles, critically praised independent dramas, and prestige streaming television.

Key Films

• Layer Cake (2004) — A breakout appearance opposite Daniel Craig, before his Bond era. Smart British crime cinema.
• Alfie (2004) — A memorable turn alongside Jude Law in the remake of the 1966 classic.
• Factory Girl (2006) — Her most talked-about performance. She played Edie Sedgwick opposite Guy Pearce as Andy Warhol. Critics noted her physical and emotional transformation.
• G.I. Joe: The Rise of Cobra (2009) — High-budget action blockbuster; her biggest mainstream global release at that point.
• Foxcatcher (2014) — Quiet, haunting, and restrained. She matched Steve Carell and Channing Tatum beat for beat.
• American Sniper (2014) — Clint Eastwood-directed box office hit with Bradley Cooper. Sienna Miller earned a Critics’ Choice nomination for her role as Taya Kyle.
• The Lost City of Z (2016) — Period adventure drama. Strong critical response.
• 21 Bridges (2019) — New York-set crime thriller with Chadwick Boseman.
• Wander Darkly (2020) — Emotionally ambitious indie drama; demonstrated serious dramatic range.
• Horizon: An American Saga (2024) — Kevin Costner’s ambitious Western epic, in which she plays a central role.

Television

• Keen Eddie (2003) — Her earliest US network television credit.
• Anatomy of a Scandal (2022, Netflix) — Six-part thriller series based on Sarah Vaughan’s novel. Her performance here sparked a genuine reappraisal of her career and reached millions of new viewers who hadn’t followed her earlier work.

Jude Law and Sienna Miller: What Actually Happened

The relationship between Jude Law and Sienna Miller became the defining celebrity news story of mid-2000s Britain. They met on the set of Alfie in 2003 and became engaged in December 2004. In July 2005, Jude Law issued a public apology after reports emerged of an affair with his children’s nanny, Daisy Wright.

The engagement ended. The press coverage was relentless. Sienna Miller was photographed daily, commentary was constant, and opinion was rarely kind to either party.

She didn’t withdraw. She continued working, appeared at public events, and spoke with controlled composure in interviews. Jude Law and Sienna Miller briefly reconciled in 2009 before separating for good.

The experience informed her perspective on fame, privacy, and media scrutiny in ways she has discussed openly. In 2011, she gave evidence to the Leveson Inquiry into UK press ethics, describing the impact of tabloid intrusion on her mental health and daily life. Her testimony was one of the most cited in the entire inquiry.

Sienna Miller’s Relationships and Children

After the Jude Law chapter, Sienna Miller began a relationship with British actor Tom Sturridge. They welcomed their daughter, Marlowe Ottoline Layng Sturridge, in July 2012. They separated in 2015 but maintained a close, publicly respectful co-parenting arrangement — something both have spoken about positively in the years since.

In 2022, Sienna Miller began dating Oli Green, a model and creative professional. The relationship became public through paparazzi photography and was later confirmed in interviews.

In 2023, Sienna Miller confirmed she was expecting a second child — her baby with Oli Green. Their daughter was born in 2023. Sienna Miller has spoken about pregnancy and motherhood across multiple interviews, describing both experiences as the most grounding of her life.

As of 2025, Sienna Miller and Oli Green remain together.

Is Sienna Miller Married?

Sienna Miller has never legally married. She was engaged twice — first to Jude Law in 2004, then to Tom Sturridge — but neither relationship led to marriage. When journalists have pressed the question, she has consistently made clear that marriage, as a formal institution, is not something she prioritizes over the quality and honesty of a relationship itself.

Her position on this is neither defensive nor ideological — it’s personal and clearly considered. She is a parent twice over and describes her relationship with Oli Green as meaningful and stable. The absence of a legal ceremony does not reflect instability; it reflects her own clearly stated values.

Sienna Miller’s Hair: The Style That Built a Movement

Few elements of celebrity style have been more imitated or more genuinely influential than Sienna Miller’s hair. Her signature — loose, naturally textured blonde waves — became the visual center of the boho chic movement that defined British fashion from roughly 2004 to 2008.

Hairdressers across London, Manchester, and beyond reported weekly requests to replicate “the Sienna Miller look.” The style had a specific quality: it appeared effortless. It was warm in tone, slightly undone, and worked whether she was photographed at Glastonbury or a film premiere.

Sienna Miller Hair Evolution

Her colorist and hair team have discussed her preference for maintaining natural hair health off-camera. She air-dries where possible, uses lightweight oils, and avoids excessive heat styling. The result is hair that photographs well because it genuinely is well-maintained — not because it’s been aggressively styled to appear that way.

Sienna Miller’s Fashion Legacy

Sienna Miller did not just wear fashion — she altered it. The Glastonbury Festival 2004 photographs, featuring her in layers of vintage pieces, leather boots, and flowing fabrics, are now cited in fashion journalism as a turning point. Boho chic didn’t begin with her, but she gave it a face the public immediately connected with.

She co-designed a capsule collection for Pepe Jeans London. She has appeared in campaigns for Emporio Armani and featured as a central figure in fashion retrospectives about 2000s British style culture. Publications including Harper’s Bazaar, Vogue, and The Sunday Times Style have named her among the most influential style figures of the past two decades.

Her approach is worth studying: she never chased trends. She wore what worked for her, adapted over time, and made it look natural because it was.

Awards and Critical Recognition

Sienna Miller’s work has earned consistent critical recognition even when formal award bodies were slower to notice.

• Critics’ Choice Movie Award — Nominated, Best Supporting Actress, American Sniper (2015)
• Empire Award — Nominated, Best British Actress
• BAFTA — Considered for nominations across multiple films
• Anatomy of a Scandal generated significant awards conversation; her performance was one of the series’ most praised elements

Film critics including those writing for The Guardian, The Times, and Variety have repeatedly noted her ability to find emotional specificity in roles that other actors might flatten. Her Factory Girl performance remains a reference point in discussions of biographical film acting.

Why Sienna Miller Still Matters in 2025

Three things keep Sienna Miller genuinely relevant rather than nostalgically relevant.

First, her Netflix series Anatomy of a Scandal reached a new generation of viewers — people in their twenties who now follow her work without the tabloid-era baggage that older audiences carry.

Third, she keeps making smart choices. Horizon: An American Saga — Kevin Costner’s ambitious 2024 Western — is a career move that prioritizes ambition over safety. That pattern of quality-first decisions sustains a career across decades. Few performers from the same mid-2000s era remain as active, respected, and creatively relevant.

6 Frequently Asked Questions

Q1: How old is Sienna Miller in 2025?

Sienna Miller is 43 years old. She was born on December 28, 1981, in New York City.

Q2: What are Sienna Miller’s best movies and TV shows?

Her standout screen work includes Factory Girl (2006), American Sniper (2014), Foxcatcher (2014), and the Netflix series Anatomy of a Scandal (2022). For newcomers, Anatomy of a Scandal is the best starting point.

Q3: What happened between Jude Law and Sienna Miller?

They met on a film set, got engaged in 2004, and separated publicly in 2005 following Jude Law’s admitted affair. They briefly reconciled in 2009 before separating permanently. Sienna Miller later gave testimony at the UK’s Leveson Inquiry about the press intrusion she experienced during that period.

Q4: Does Sienna Miller have children?

She has two daughters. Her eldest, Marlowe, was born in July 2012 with actor Tom Sturridge. Her second daughter arrived in 2023, with partner Oli Green.

Q5: Has Sienna Miller ever been married?

No. She has been engaged twice — to Jude Law and Tom Sturridge — but has never married. She has spoken openly about not placing strong personal value on formal marriage.

Q6: Why did Sienna Miller’s hair become so famous?

Her tousled blonde waves defined boho chic in British fashion from 2004 onward. The style was widely imitated because it appeared effortless and translated across formal and casual settings. It remains a reference point in UK fashion history.

What to Watch or Read Next

If you’re new to Sienna Miller’s work, start here:

• Watch: Anatomy of a Scandal on Netflix (2022) — her best recent performance
• Watch: Factory Girl (2006) — her most transformative film role
• Read: Her Leveson Inquiry testimony (available via The Guardian archive) — honest, detailed, and important for understanding her relationship with the press
• Follow: Her Instagram account for current projects and personal updates

Strong Conclusion

Sienna Miller’s career is not a comeback story — because she never left. She spent two decades making deliberate choices, absorbing public scrutiny with composure, raising two children, and doing work that holds up over time. The tabloid headlines never told the real story. The films, the performances, and the directness with which she speaks about her own life do.

If something in this guide sent you toward one of her films or sparked a new appreciation for what she’s built — that’s exactly the point. Start watching. Start with Anatomy of a Scandal. You’ll understand quickly why her career has lasted this long.