Few figures in modern entertainment have navigated the fine line between high-octane celebrity and serious artistic credibility as successfully as Sienna Miller. Bursting onto the scene in the early 2000s as the ultimate “It Girl,” she defined a generation’s fashion sense before proving her mettle as one of the most resilient and versatile actresses of her time.
From the tabloid storms of her twenties to the critical acclaim of her forties, Miller has rewritten her narrative. Today, she is celebrated not just for her impeccable style, but for gritty, transformative performances in films like American Woman and American Sniper. As we move through 2025, Miller remains a headline-maker, recently confirming exciting personal news while starring in some of the industry’s most anticipated projects.
This comprehensive guide explores the life of Sienna Miller—her age, movies, net worth, style evolution, and the resilience that makes her a true Hollywood survivor.
Early Life: Transatlantic Roots
Born Sienna Rose Diana Miller on December 28, 1981, in New York City, she possesses a unique transatlantic identity that has defined her career. She is the daughter of Josephine, a South African-born former model, and Edwin Miller, an American banker turned art dealer.
While born in the US, Miller is quintessentially British in spirit. At the age of 18 months, her family relocated to London, settling in the affluent Chelsea neighborhood. Following her parents’ divorce, she grew up between London and the serene countryside of Wiltshire. This duality—the grit of New York and the polish of London—would later become a hallmark of her acting range.
Miller was educated at the Heathfield School in Ascot, a boarding school where her love for the arts began to take shape. However, her ambition drew her back to her birthplace. At 18, she returned to New York City to enroll in the prestigious Lee Strasberg Theatre and Film Institute, a training ground that honed the raw emotional depth she would later bring to her dramatic roles.
Career Timeline: From “It Girl” to Critical Darling
Sienna Miller’s career trajectory is a masterclass in reinvention. Her journey can be broken down into distinct eras that showcase her growth from a supporting player to a leading lady.
The Breakthrough Years (2001–2006)
Miller’s early work included modeling gigs and small television roles, such as in the BBC sitcom Bedtime. However, 2004 was the year everything changed. She starred opposite Daniel Craig in the sleek British crime thriller Layer Cake, playing the alluring Tammy.
That same year, she captivated audiences in Alfie alongside Jude Law. While the film received mixed reviews, Miller’s charisma was undeniable. She capped off this era with Casanova (2005), proving she could handle period pieces with wit and charm.
The Turning Point: Factory Girl (2006)
Critics began to take Miller seriously with her portrayal of Edie Sedgwick in the biopic Factory Girl. While the film itself was controversial, Miller’s performance was widely praised. She captured the fragility and manic energy of Andy Warhol’s muse, demonstrating that she was more than just a tabloid fixture.
The Resurgence (2014–Present)
After a brief hiatus where she focused on motherhood and stage work (including a successful run in Cabaret), Miller returned with a vengeance. The mid-2010s saw her starring in Academy Award-nominated films:
- Foxcatcher (2014): A subdued, unrecognizable turn as the wife of a murdered wrestler.
- American Sniper (2014): Directed by Clint Eastwood, Miller played Taya Kyle. She brought emotional weight to the role of a soldier’s wife, grounding the film’s chaotic war sequences with heart.
- The Lost City of Z (2016): Critics praised her for turning a potentially “nagging wife” archetype into a fully realized, feminist character.
Her crowning achievement came with American Woman (2018). Playing a working-class grandmother raising her grandson after her daughter disappears, Miller delivered a career-best performance. It was raw, unglamorous, and devastatingly real, finally earning her the “serious actress” label she had long chased.
Sienna Miller: A Modern Fashion & Cultural Icon
It is impossible to discuss Sienna Miller without discussing her impact on fashion. In the mid-2000s, she single-handedly popularized the “Boho Chic” aesthetic.
The Miller Effect
Before influencers and Instagram, there was Sienna Miller at Glastonbury. Her signature mix of high and low fashion—pairing vintage coin belts, floaty peasant skirts, and Ugg boots with designer bags—changed the way a generation dressed.
Unlike the polished, stylist-curated looks of today, Sienna Miller’s style felt authentic and effortless. She didn’t just wear trends; she created them. This influence translated into business success when she co-founded the fashion label Twenty8Twelve with her sister, Savannah Miller, which ran successfully for several years.
Even in 2025, her red carpet choices are among the most anticipated. She has matured from boho princess to sophisticated glamour, frequently serving as a muse for Gucci and Chloe, yet she retains that signature relaxed coolness.
Personal Life, Relationships & Motherhood
Sienna Miller’s personal life has often been as publicized as her films, though in recent years, she has guarded her privacy fiercely.
High-Profile Romances
Her early 2000s engagement to Jude Law made them one of the world’s most photographed couples. Their relationship, marked by intense media scrutiny, ended in 2006, though they briefly reconciled years later.
Motherhood and Family
Miller found stability with actor Tom Sturridge, whom she dated from 2011 to 2015. The couple shares a daughter, Marlowe Ottoline Layng Sturridge, born in 2012. Miller has often spoken about how motherhood shifted her priorities, making her more selective about roles to ensure she could be present for her daughter.
Latest Relationship News (2024–2025)
Currently, Sienna Miller is in a relationship with actor Oli Green. The couple welcomed a daughter in early 2024.
Breaking News (December 2025): In a delightful surprise to fans, Sienna Miller revealed at the 2025 British Fashion Awards that she is pregnant with her third child (her second with Oli Green). At 43, Miller continues to challenge societal timelines regarding motherhood, having previously been open about freezing her eggs to take control of her reproductive future.
Latest News and Upcoming Projects (2025)
Sienna Miller shows no signs of slowing down. 2025 is shaping up to be a massive year for the actress.
- Horizon: An American Saga: Miller stars in Kevin Costner’s epic Western film series. The multi-part saga is one of the most ambitious projects in Hollywood history, with Miller playing a pioneer woman navigating the brutal American frontier.
- ‘War’ (TV Series): It was recently announced that Miller will reunite with Dominic West for a new HBO and Sky series titled War. The series is expected to be a gripping legal thriller centered on a high-stakes divorce.
- Red Carpet Returns: Her appearance at the Fashion Awards in December 2025 not only confirmed her pregnancy but solidified her status as a fashion darling, wearing a look that immediately went viral.
Sienna Miller Net Worth and Endorsements
As of 2025, Sienna Miller’s net worth is estimated to be approximately $18 million.
Her wealth is diversified across several streams:
- Film & TV Salaries: She commands significant fees for major studio projects like G.I. Joe: The Rise of Cobra and prestige dramas like Anatomy of a Scandal.
- Modeling & Endorsements: Miller has been the face of massive global campaigns for Hugo Boss, Coca-Cola, Burberry, and Marks & Spencer. Her association with M&S in particular was credited with revitalizing the brand’s image for younger shoppers.
- Business Ventures: Proceeds from her former fashion label Twenty8Twelve and real estate investments in the UK and US.
Legacy & Impact
Sienna Miller’s legacy is one of survival and evolution. She survived the toxic tabloid culture of the 2000s—which notably led to her testifying at the Leveson Inquiry regarding phone hacking—and emerged with her dignity and career intact.
She paved the way for actresses to reclaim their narratives, proving that being a fashion icon and a serious character actor are not mutually exclusive. Her influence on the 21st-century aesthetic is undeniable, but her contribution to cinema, particularly in roles that highlight the quiet strength of women, will be her lasting mark.
Frequently Asked Questions (FAQs
1. How old is Sienna Miller?
Born on December 28, 1981, Sienna Miller is currently 43 years old.
2. Who is Sienna Miller’s partner?
Sienna Miller is currently in a relationship with actor Oli Green. They have been together since 2022.
3. How many children does Sienna Miller have?
She has two children and is currently expecting her third. She shares her eldest daughter, Marlowe, with Tom Sturridge, and has a second daughter (born 2024) with Oli Green. In December 2025, she announced she is pregnant with her third child.
4. What is Sienna Miller’s most famous movie?
While American Sniper is likely her most commercially successful film, her performance in American Woman is widely considered her best critical work. She is also famously known for Factory Girl and Layer Cake.
5. Is Sienna Miller American or British?
She holds dual citizenship. She was born in New York but raised in London, and she considers herself to be “English but with an American spirit.”
6. What is Sienna Miller’s net worth in 2025?
Her estimated net worth stands at around $18 million, accumulated through her two-decade acting career and high-profile fashion endorsements.
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