Sienna Miller – Biography, Relationships, and Career in 2026

Sienna Miller has been a fixture on both sides of the Atlantic for more than two decades, moving from high-profile modeling campaigns to critically respected dramatic roles. Her personal life has often drawn as much attention as her work, with high-profile engagements and a growing family making headlines. In 2026, the actress welcomed her third child and confirmed her engagement to actor Oli Green, marking a new chapter in a career that began in the late 1990s.

Born in New York City and raised in London, Miller holds dual citizenship and has built a filmography that spans independent dramas, major studio releases, and stage work in London’s West End and on Broadway. This article covers her biography, relationships, children, career highlights, and the most frequently asked questions about her life as of 2026.

Who Is Sienna Miller? Biography and Early Life

Sienna Rose Diana Miller was born on December 28, 1981, in New York City. Her father, Edwin Miller, was an American banker, and her mother, Jo Miller, was a British former model who later became a personal assistant. After her parents’ divorce, she moved to London with her mother and attended the Lee Strasberg Theatre and Film Institute and the British American Drama Academy.

Miller began her career in 1999 as a model, appearing in campaigns for Burberry and other brands. She transitioned to acting in the early 2000s, with her first major television role in the BBC series Bedtime in 2001. Her breakthrough came in 2004 when she starred opposite Daniel Craig in Layer Cake, a performance that opened the door to leading roles in both Hollywood and British cinema.

• Sienna Miller has never been married but has been engaged three times.
• She is currently engaged to actor Oli Green, a relationship that began in late 2021 or early 2022.
• She has three children: a daughter with ex-fiancé Tom Sturridge, and a daughter and a son with Oli Green.
• Her breakthrough film role was in Layer Cake (2004), opposite Daniel Craig.
• Though primarily an actress, she has performed songs for film soundtracks, including for Factory Girl.
• She maintains a relatively private Instagram presence under the handle @siennathing.
• Her career spans more than 25 years across film, television, and theater.

Is Sienna Miller Married? Relationships and Partner (Oli Green)

Sienna Miller has never been married, a fact that often surprises readers given the number of long-term partnerships she has had. She has been engaged three times: to Jude Law, to Tom Sturridge, and most recently to Oli Green. The engagement to Green was confirmed in June 2026.

Engagement to Jude Law (2004–2006)

Miller met Jude Law in 2004 on the set of Alfie. They became engaged in December 2004 but separated in November 2005. The relationship ended for good in 2006. According to publicly available accounts, a pregnancy during this time was terminated. No children resulted from the relationship.

Relationship with Tom Sturridge (2011–2015)

Miller began a relationship with British actor Tom Sturridge in 2011. The couple became engaged and welcomed a daughter, Marlowe Ottoline Layng Sturridge, in July 2012. They separated in 2015 but have remained amicable co-parents.

Current Relationship with Oli Green (2021–Present)

Miller began dating actor Oli Green in late 2021 or early 2022. The couple has a 15-year age gap: Green was born in 1996, making him 29 years old as of 2025. Despite the difference, the relationship has been described as stable and private compared to Miller’s earlier, more publicized partnerships. The couple attended the Oasis concert at Wembley Stadium in July 2025 and announced a pregnancy in December 2025. Their engagement was confirmed in June 2026.

Does Sienna Miller Have Children? Her Daughter and Family Life

Sienna Miller is the mother of three children. Her eldest, daughter Marlowe Ottoline Layng Sturridge, was born in July 2012 and is the child of Miller and her former fiancé Tom Sturridge. In January 2024 (some sources cite December 2023), Miller gave birth to a daughter with Oli Green. In April 2026, she welcomed a son, also with Green.

Miller has spoken in interviews about prioritizing her children’s privacy, particularly regarding their exposure to the media. She has not publicly shared the names of her two younger children with Oli Green. Marlowe, now a teenager, has occasionally been photographed with her mother at public events, but Miller generally keeps her family life out of the spotlight.

What Are the Best Sienna Miller Movies and TV Shows?

Miller’s filmography spans more than 30 roles across film, television, and stage. She is known for choosing a mix of commercial projects and independent films. Below are some of her most notable credits.

Breakthrough and Early Success (2004–2007)

Her debut in Layer Cake (2004) put her on the map. That same year, she appeared opposite Jude Law in Alfie. She went on to star in Casanova (2005) and Factory Girl (2006), where she portrayed Edie Sedgwick. The latter required her to sing on screen, which she did for the film’s soundtrack.

Established Career (2008–2019)

During this period, Miller took on a wide range of roles. She starred alongside Keira Knightley in The Edge of Love (2008), played a supporting role in Clint Eastwood’s American Sniper (2014), and appeared in Burnt (2015) with Bradley Cooper. She also starred in Ben Affleck’s Live by Night (2016) and the crime thriller 21 Bridges (2019) with Chadwick Boseman. Her role in The Current War (2019) added another drama to her resume.

Recent and Upcoming Work (2020–Present)

In 2024, Miller appeared in Horizon: An American Saga, directed by Kevin Costner. She continues to select projects selectively, balancing her career with raising her children and planning her wedding to Oli Green.

What Is Sienna Miller’s Life and Career Timeline?

The following timeline highlights key events in Miller’s personal and professional life, as documented by multiple sources.

1. 1981 – Born December 28 in New York City. Raised in London after her parents’ divorce.
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2. 1999 – Begins her career as a model.
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3. 2001 – First major TV role in the BBC series Bedtime.
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4. 2004 – Breakthrough role in Layer Cake. Becomes engaged to Jude Law in December.
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5. 2012 – Begins relationship with Tom Sturridge. Daughter Marlowe is born in July.
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6. 2015 – Separates from Tom Sturridge.
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7. Late 2021 / Early 2022 – Begins relationship with actor Oli Green.
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8. 2024 – Daughter born to Miller and Oli Green. Appears in Horizon: An American Saga.
9. 2025 – Attends Oasis concert at Wembley Stadium with Oli Green. Pregnancy announced in December.
10. April 2026 – Son born to Miller and Oli Green.
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11. June 2026 – Engagement to Oli Green confirmed.

What Is Known and What Remains Uncertain About Sienna Miller?

While much of Miller’s life is publicly documented, some areas remain unclear or are frequently misunderstood. The table below distinguishes established facts from information that is less certain or subject to variation across sources.

How Did Sienna Miller Build Her Career?

Miller’s transition from fashion model to respected actress was gradual. After being scouted at age 18, she worked with major brands such as Burberry before deciding to pursue acting. She trained at the Lee Strasberg Theatre and Film Institute and later at the British American Drama Academy, grounding her approach in method techniques.

Her early film roles in Layer Cake and Alfie positioned her as a rising talent, but she avoided being typecast by taking on varied projects. The role of Edie Sedgwick in Factory Girl (2006) demonstrated her willingness to tackle challenging biographical material. Later, her supporting role in American Sniper (2014) showed she could hold her own in a major war drama directed by Clint Eastwood.

Miller has also performed on stage, including Broadway and West End productions. This theatrical experience has informed her screen work and contributed to her reputation as a serious performer. For readers interested in other actors with similarly diverse careers, see Naomie Harris – Biography, Movies, Net Worth & Age. As of 2026, she continues to select projects that allow her to balance professional commitments with family life.

Where to Find Reliable Information About Sienna Miller

Readers seeking accurate, up-to-date information about Sienna Miller should consult authoritative biographical databases and verified social media accounts. Below are key sources referenced in this article.

“Sienna Miller was born on December 28, 1981, in New York City, and raised in London. She holds dual US-UK citizenship.”

— Wikipedia entry for Sienna Miller. View source

“Miller began her professional acting career in 1999 with a modeling career before transitioning to television and film.”

— IMDB biography of Sienna Miller. View source

“Sienna Miller has been featured in Vogue for her fashion sense and public appearances, including her attendance at high-profile events in 2024 and 2025.”

— Vogue tag page for Sienna Miller. View source

What Makes Sienna Miller a Notable Public Figure?

Sienna Miller’s durability in the entertainment industry is unusual for someone who began as a model and faced intense tabloid scrutiny early in her career. She has managed to maintain a steady acting career while raising three children and navigating a personal life that has repeatedly drawn public interest. Her engagement to Oli Green and the birth of their son in 2026 mark the latest chapter in a life that has balanced public visibility with a clear preference for privacy in matters concerning her children. For readers interested in other British actresses of similar stature, see Dakota Fanning – Age, Net Worth, Movies and Personal Life.

Frequently Asked Questions About Sienna Miller