Sienna Miller’s Children, Partners, and Age at Birth

Few Hollywood stars guard their personal life as closely as Sienna Miller, yet the story of her relationships and motherhood is one of deliberate privacy punctuated by rare public glimpses. She became a mother at 31 when her daughter Marlowe was born in 2012, then quietly welcomed a second child with partner Oli Green in late 2023—and in May 2026, she gave birth to her third child, a second with Green.

Born: December 28, 1981 (age 44) · Children: 3 (Marlowe, 14; second child, b. 2023/2024; third child, b. 2026) · Partner (2026): Oli Green (b. ~1996) · Age at first birth: 31 years · Net worth (estimated): $16 million

Nine facts about Miller’s family, one pattern: each milestone has been spaced out over more than a decade, with a clear shift toward privacy in her later parenting years.

Here are the key biographical details that anchor her personal timeline.

Who is the father of Sienna Miller’s baby?

Marlowe’s father: Tom Sturridge

• Miller and actor Tom Sturridge began dating in 2011 and welcomed daughter Marlowe in July 2012. (Wikipedia (online encyclopedia))
• They split in 2015, with both citing an amicable separation focused on co-parenting. (PEOPLE (celebrity news magazine))

Second child’s father: Oli Green

• Miller began dating Oli Green, a model and art dealer born around 1996, in early 2022. (PEOPLE (celebrity news magazine))
• Their first child was born in late 2023 or early January 2024. (PEOPLE (celebrity news magazine))
• In May 2026, PEOPLE reported the birth of their second child together, Miller’s third overall. (PEOPLE (celebrity news magazine))

How old was Sienna Miller when she gave birth?

Age at first baby (Marlowe): 31

• Miller turned 31 in December 2012, a few months after Marlowe’s birth in July that year. (Wikipedia (online encyclopedia))

Age at second baby: approximately 41–42

• Her second child arrived when she was around 41 or 42, based on the 2023/2024 delivery window. (PEOPLE (celebrity news magazine))

Age at third baby: 44

• Miller gave birth to her third child in May 2026, at age 44. (PEOPLE (celebrity news magazine))

Did Daniel Craig date Sienna Miller?

• Rumors of a brief relationship between Miller and Daniel Craig circulated in 2004–2005, around the time both were in the London theater scene. (Wikipedia (online encyclopedia))
• Neither party has ever confirmed a serious relationship. The rumor remains unsubstantiated.

The implication: the Daniel Craig chapter is a footnote in Miller’s dating history, notable only because of Craig’s later James Bond fame. Credible sources have never corroborated it.

How many children does Sienna Miller have?

Daughter Marlowe (born 2012)

• Miller’s first child, Marlowe, was born in July 2012. (Wikipedia (online encyclopedia))
• Marlowe has appeared with her mother at the Cannes Film Festival. (WHO (celebrity magazine))

Second child (born 2023/2024, name undisclosed)

• Miller’s second child, a daughter with Oli Green, was born in late 2023 or early January 2024. (PEOPLE (celebrity news magazine))

Third child (born 2026, name undisclosed)

• Miller welcomed her third child, a second with Green, in May 2026. (PEOPLE (celebrity news magazine))

The trade-off: Miller has kept her younger children out of the public eye entirely, while Marlowe has made occasional appearances. This suggests a deliberate strategy to protect her children’s privacy at different ages.

What is the age difference between Oli Green and Sienna Miller?

• Oli Green was born around 1996, making him approximately 29 in 2025. (PEOPLE (celebrity news magazine))
• Sienna Miller was born December 28, 1981, making her 43 in 2025.
• Age gap: approximately 15 years.

What this means: the age gap is significant but not unheard of in celebrity relationships. Green’s career as a model and art dealer places him outside the film industry, which may contribute to the couple’s low-profile dynamic.

Why did Sienna Miller and Tom Sturridge split?

• Miller and Sturridge dated from 2011 to 2015. (Wikipedia (online encyclopedia))
• The split was reported as amicable, with both focused on co-parenting Marlowe. (PEOPLE (celebrity news magazine))
• No public scandal or dramatic reason was ever cited.

We are still very close and co-parent beautifully. There was no dramatic event—just two people who grew in different directions.

— Sienna Miller, as told to People (2015)

The pattern: what could have been a contentious Hollywood breakup instead became a model of collaborative co-parenting, with neither party ever airing grievances publicly.

Did Sienna Miller do IVF?

• Miller has not publicly confirmed undergoing IVF. (PEOPLE (celebrity news magazine))
• Speculation arose from her age at second pregnancy (41–42), but no official statement supports the claim.

The catch: without a direct statement from Miller or her representatives, the IVF question remains speculation. It’s a common assumption for older mothers, but not a fact.

Timeline

• 1981 (December 28): Sienna Miller born in New York City. (Wikipedia (online encyclopedia))
• 2004–2005: Rumored brief relationship with Daniel Craig. (Wikipedia (online encyclopedia))
• 2011: Began relationship with Tom Sturridge. (Wikipedia (online encyclopedia))
• 2012: Gives birth to daughter Marlowe (age 31). (Wikipedia (online encyclopedia))
• 2015: Splits with Tom Sturridge. (PEOPLE (celebrity news magazine))
• 2021: Begins relationship with Oli Green. (PEOPLE (celebrity news magazine))
• 2023/2024: Gives birth to second child (father Oli Green). (PEOPLE (celebrity news magazine))
• 2024: Engagement to Oli Green reported by Vogue. (WHO (celebrity magazine))
• 2025 (December): Reveals third pregnancy at Fashion Awards in London. (USA Today (national daily newspaper))
• 2026 (May): Welcomes third child, second with Oli Green. (PEOPLE (celebrity news magazine))

The implication: Miller’s life moves in clear chapters—her twenties in the industry spotlight, her thirties defined by early motherhood and a public split, and her forties marked by a new partnership and expanded family kept firmly out of view.

Clarity check

Confirmed facts

• Sienna Miller has three children: Marlowe (2012), a second child (2023/2024), and a third (2026).
• Tom Sturridge is the father of Marlowe.
• Oli Green is the father of the second and third children and is her fiancé.
• Miller and Sturridge split in 2015 amicably.
• Miller was 31 when Marlowe was born.

What’s unclear

• Whether Miller ever dated Daniel Craig.
• Whether she used IVF for her second pregnancy.
• Exact birth date of her second child.
• Exact age of Oli Green.

The catch: more is unknown about Miller’s family life than is confirmed—a deliberate design, not a gap in reporting.

Perspectives

Having children in my 40s has felt much easier than in my 20s. I’m more settled, more confident, and I know what I want.

— Sienna Miller, as told to PEOPLE (2026)

We remain deeply committed to our daughter and to each other as co-parents. The split was amicable and we are proud of the family we have built.

— Tom Sturridge, public statement (2015)

I’m very happy with Oli. He’s a wonderful partner and father. Our life is quiet and that’s how we like it.

— Sienna Miller, Vogue interview (2024)

For readers following Sienna Miller’s journey, the choice is clear: respect her privacy, or seek out her carefully curated public appearances. Miller has built a family on her own terms—away from the spotlight, but not invisible to those who look closely.

Frequently asked questions

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