Sienna Miller: Children, Father, and Personal Life

Sienna Miller has spent two decades in the spotlight, but lately the headlines aren’t about her latest film—they’re about her growing family and the man by her side. She went from modeling runways to leading Hollywood productions while quietly raising a daughter and expanding her family in her forties. This fact-checked dossier traces her relationships, children, and the timeline that shaped her personal life.

Born: 28 December 1981 (age 42) ·
Children: 3 ·
Partner: Oli Green (engaged) ·
Known For: Acting and modeling ·
Citizenship: British, American

Seven key facts in one glance:

Who is the father of Sienna Miller’s children?

Sienna Miller’s three children come from two fathers: actor Tom Sturridge and model-actor Oli Green. Sturridge is the father of her eldest daughter Marlowe, born in July 2012 (People). Green is the father of her two younger children: the first welcomed in late 2023 and a third child reported in 2026 (InStyle).

The implication: Miller built a family with two partners, maintaining stable co-parenting relationships in both cases.

Father of her first child: Tom Sturridge

• Tom Sturridge, an English actor, dated Miller from around 2011 to 2015 (SCMP).
• Their daughter Marlowe was born in July 2012 (People).
• Miller and Sturridge remain close co-parents (ELLE).

Father of her second and third children: Oli Green

• Oli Green, a model and actor, and Miller were first linked romantically in early 2022 (SCMP).
• They welcomed a child together in late 2023 (People).
• A third child arrived in 2026, according to reports from InStyle and E! News.
• The couple is now engaged (ELLE).

How many kids does Sienna Miller have?

The most reliable reporting indicates Miller has three children. The first, Marlowe Sturridge, was born in 2012. The second, whose name and gender have not been publicly disclosed, was born in 2023. A third child was born in 2026 (People).

The pattern: three children across 14 years, with the youngest born when Miller was 44.

Three children: a timeline

• Marlowe Sturridge – born July 2012, daughter with Tom Sturridge (People).
• Second child – born late 2023, with Oli Green. Gender and name not confirmed (People).
• Third child – born 2026, with Oli Green. Miller revealed the pregnancy in December 2025 at the Fashion Awards (People).

How old was Sienna Miller when she had her baby?

Miller became a mother at age 30 with her first child and at 41 with her second. Her third child arrived at age 44 (calculated from her birth date of 28 December 1981, based on Wikipedia).

• First birth: July 2012 – age 30 (People).
• Second birth: late 2023 – age 41 (People).
• Third birth: 2026 – age 44 (based on 2026 reports from InStyle).

The implication: Miller had her children across a 14-year span, in her 30s and 40s, a pattern that contrasts with many Hollywood peers who start families earlier.

Is Sienna Miller with Oli Green?

Yes, Sienna Miller is in a serious relationship with Oli Green. The two are engaged and share two children (ELLE).

The pattern: Miller’s relationship with Green marks a new family chapter built after her split with Sturridge.

Current relationship status: engaged

Miller and Green became publicly linked in early 2022 (SCMP). By 2023 they had a child together, and in 2024 she confirmed their engagement in a Harper’s Bazaar UK interview (ELLE).

Oli Green’s background

Green works as a model and actor. In a June 2024 interview, Miller described him as 28 years old at the time, making him 14 years younger than her (ELLE). Reports from early 2026 put his age at 29, consistent with a birth year around 1996–1997 (SCMP).

What is Sienna Miller’s ethnicity?

Miller was born in New York City to an American father and a South African mother, and holds dual British-American citizenship (Wikipedia).

• Her father, Edwin Miller, is of English and Jewish descent (Wikipedia).
• Her mother, Josephine Miller, is of English and Jewish ancestry (Wikipedia).
• She was raised in London and attended Heathfield School (Wikipedia).

The pattern: Miller’s background is a mix of English, Jewish, and South African roots, with a childhood split between the U.S. and the U.K.

Why did Sienna Miller and Tom Sturridge split?

Miller and Sturridge were engaged from 2011 to 2015. Neither has provided a detailed public explanation, but sources close to the couple point to growing apart and demanding careers (SCMP).

• Relationship timeline: Dated from 2011, engaged, welcomed daughter Marlowe in 2012, split in 2015 (SCMP).
• Co-parenting: The two remain on good terms and co-parent Marlowe amicably (ELLE).

“We’re really good friends and we co-parent beautifully.” — Sienna Miller on Tom Sturridge (ELLE)

Timeline signal

• 1981 – Born in New York City (Wikipedia)
• 1990s – Moves to London, begins modeling (Wikipedia)
• 2004 – Breakthrough role in Layer Cake
• 2011–2015 – Relationship with Tom Sturridge (SCMP)
• 2012 – Daughter Marlowe born (People)
• 2022 – Publicly linked to Oli Green (SCMP)
• 2023 – Second child born (People)
• 2024 – Engagement confirmed (ELLE)
• 2025 – Third pregnancy announced at Fashion Awards (People)
• 2026 – Third child born (InStyle)

Clarity check: Confirmed facts vs. what’s unclear

Summary: The family she built on her own terms

Sienna Miller has navigated two high-profile relationships, three children, and a career that spans more than 20 years. She chose to start a family with one partner, then built a new chapter with a younger man, all while keeping her children’s lives largely private. The takeaway: Miller prioritized stability and co-parenting over public scrutiny, and in doing so, created a blended family of five that functions on its own schedule. The pattern shows Miller controlling her narrative without sacrificing her family’s privacy.

Frequently asked questions