Sienna Miller has carved out an impressive career that spans blockbuster films, critically acclaimed indies, and high-profile fashion collaborations. The American-British actress, now 44, has transformed from tabloid fixture to respected performer with an estimated net worth of $18 million. She’s currently expecting her third child and working on several major Hollywood projects that promise to cement her status as one of Britain’s most versatile actresses.
Early Life and Education
Born Sienna Rose Diana Miller on December 28, 1981, in New York City, she’s the daughter of American banker-turned-art dealer Edwin Miller and British former model Josephine Miller, who once worked as David Bowie’s personal assistant. The family moved to London’s Chelsea neighbourhood when Sienna was just 18 months old and that gave her that transatlantic identity she’s maintained throughout her career.
When she was six, her parents divorced, and her mother Josephine, who was battling breast cancer at the time, raised Sienna and her older sister Savannah in Parsons Green. At eight, she began boarding at Heathfield School in Ascot, where she discovered her passion for acting whilst also playing lacrosse.
After graduating, she pursued formal training at the prestigious Lee Strasberg Theatre and Film Institute in New York. Her modelling career launched simultaneously with her acting aspirations. She posed for the 2003 Pirelli Calendar and Italian Vogue, landing contracts with Select Model Management London before her breakthrough film role arrived.
Career
Miller’s career properly kicked off in 2004 with two significant roles. She appeared in Layer Cake alongside Daniel Craig and starred opposite Jude Law in the remake of Alfie, where she played Nikki, an independent woman with a free spirit. The film brought mixed reviews but launched her into Hollywood’s spotlight.
Her portrayal of Andy Warhol’s muse Edie Sedgwick in Factory Girl (2006) earned genuine critical praise. She balanced indie credibility with blockbuster appeal, appearing in G.I. Joe: The Rise of Cobra (2009) as The Baroness before taking on weightier dramatic roles.
The turning point came with Clint Eastwood’s American Sniper (2014), where she played Taya Kyle opposite Bradley Cooper. The film grossed $547 million worldwide. Critics took notice, and better roles followed.
At 44, Miller’s experiencing what many are calling her golden age. Netflix’s Anatomy of a Scandal (2022) became the platform’s number-one English-language series, whilst Apple TV+’s Extrapolations (2023) paired her with heavyweights like Meryl Streep and Kit Harington.
The career-defining project is Kevin Costner’s epic Western Horizon: An American Saga (2024), which premiered at Cannes to a seven-minute standing ovation. TIME magazine praised her performance as Frances Kittredge, calling everything she does “compact, potent, affecting, yet at the same time infused with air and light.” She even brought her 12-year-old daughter Marlowe to the red carpet for the child’s first public appearance.
Three major projects are lined up: the Jack Ryan feature film opposite John Krasinski (announced December 2024), HBO’s two-season legal thriller WAR alongside Dominic West, and David O. Russell’s Madden biopic with Nicolas Cage, scheduled for Thanksgiving 2026.
Miller’s West End debut in As You Like It (2005) at Wyndham’s Theatre launched a theatre career that’s earned some of her strongest reviews. She’s done Broadway (After Miss Julie, 2009), replaced Emma Stone in Sam Mendes’ Cabaret (2015), and received particular acclaim for playing Maggie in Cat on a Hot Tin Roof at the Apollo Theatre in 2017.
Whilst major trophies have eluded her, Miller’s earned significant recognition. Her performance as Tippi Hedren in BBC’s The Girl (2012) brought BAFTA and Golden Globe nominations for Best Actress in a Miniseries. She’s also received a BAFTA Rising Star nomination and British Independent Film Award nods for The Edge of Love and High-Rise.
Miller and sister Savannah launched the fashion label Twenty8Twelve in 2007 (named after Sienna’s birthdate). Backed by Pepe Jeans, the line sold in 20 countries before the sisters departed in 2012.
Her current fashion work’s evolved into collaboration rather than ownership. She’s partnered with Marks & Spencer since 2024, creating boho-inspired collections with her signature style. The first 33-piece collection launched in June 2024 with prices from £19.50 to £89, selling out rapidly. A second party-focused collection followed in October.
She’s also ambassador for Schwarzkopf Creme Supreme (announced March 2025) and The King’s Foundation, focusing on textiles education and sustainable fashion. In February 2025, she and partner Oli Green became the first couple to front a Frame denim campaign.
Personal Life
Miller’s personal life has been tabloid fodder for years, but she’s found stability with actor and model Oli Green. They met at a Halloween party in autumn 2021. Despite initial hesitation about their 15-year age gap (Green was born January 21, 1997), she fell hard.
“I didn’t expect to take it seriously and then quite quickly, I fell in love,” she told Harper’s Bazaar. “I wasn’t like, ‘I’m gonna get a younger boyfriend.’ It was more, ‘Fuck! Why are you young? That’s so annoying.'”
They went public at the February 2022 Vanity Fair Oscar Party and welcomed a daughter in January 2024. On December 1, 2025, at the Fashion Awards, Miller revealed her third pregnancy in a sheer white Givenchy gown. She’s clearly embracing this chapter of her life.
Her daughter Marlowe Ottoline Layng Sturridge, born July 7, 2012, is from her relationship with actor Tom Sturridge (2011-2015). They’ve maintained an unconventional but effective co-parenting arrangement. “He’s at the house and he’s going to stay there tonight. It’s not like there’s a structure for custody. We make it work,” she’s explained.
Miller was previously engaged to Jude Law (2004-2006, briefly reuniting 2009-2011), a relationship that ended after his public apology for an affair with his children’s nanny. The intense tabloid scrutiny from that period shaped her approach to privacy today. She received £100,000 in damages from News of the World in 2011 for phone hacking.
Net Worth
Miller’s net worth is at $18 million. That wealth comes from two decades of film work, fashion partnerships, and real estate investments. Her estimated annual income sits around $2 million from acting, modelling, and fashion ventures.
Her property portfolio includes a 16th-century Grade II-listed Buckinghamshire cottage, purchased in 2008 for approximately £400,000-500,000 and currently listed at £1.95 million. The property featured on Architectural Digest’s September 2022 cover. She sold her West Village townhouse for $5.3 million in 2023 after returning to London post-pandemic, citing changes to New York City.
She also previously owned an Audi TT and has maintained properties in desirable London locations, including a five-story townhouse purchased in 2011 for £2.7 million.
Philanthropy
Miller serves as ambassador for Starlight Children’s Foundation UK, working with seriously ill children. She’s also Global Ambassador for International Medical Corps, travelling to DR Congo in 2009 and Haiti following the 2010 earthquake. Her newer role with The King’s Foundation focuses on textiles education and sustainable fashion initiatives.