Sienna Miller: Biography, Children, and Relationships

Sienna Miller has spent two decades in the spotlight, but her personal story now draws as much attention as her acting career. From co-parenting daughter Marlowe with Tom Sturridge to building a new family with younger partner Oli Green, the British actress keeps steering her own course — here’s a clear, fact-checked look at her life right now.

Age: 43 (born 28 December 1981) · Height: 5 ft 6 in (1.68 m) · Children: 2 (Marlowe b. 2012; one with Oli Green b. ~2024) · Partner: Oli Green (2021–present) · Breakout Film: Layer Cake (2004)

Here are the key biographical details for Sienna Miller.

Who are the fathers of Sienna Miller’s children?

Tom Sturridge: father of Marlowe

• Miller’s first child, daughter Marlowe, was born in July 2012. Her father is British actor Tom Sturridge (People).
• Miller and Sturridge dated from 2011 to 2015 and have remained committed co-parents (People).

Oli Green: father of second child

• Miller’s second child—born around January 2024—is with model and art dealer Oli Green (ELLE).
• The couple were first photographed together at the 2022 BAFTA Film Awards (People).
• In December 2025, Miller revealed she is pregnant with a third child, which would be her second with Green (Vogue).

The pattern: Miller has maintained positive co-parenting relationships with both fathers, keeping her children’s lives private while acknowledging their presence in her family narrative.

How old was Sienna Miller when she had her last baby?

Age at first child (2012)

Miller was 30 when she gave birth to Marlowe in July 2012 (People).

Age at second child (2024)

She turned 42 just before welcoming her child with Oli Green in January 2024, according to E! News. Her 2025 pregnancy, revealed at age 43, would make her 44 when she delivers.

Bottom line: Miller had her first child at 30, her second at 42, and will be 44 with her third. She has spoken publicly about freezing her eggs at 40 (The List).

The implication: Miller’s fertility planning gave her the freedom to space her children across more than a decade.

Did Daniel Craig date Sienna Miller?

Rumored relationship in 2010

Tabliods linked Miller and Daniel Craig in 2010 after they were seen together socially, but neither party has ever confirmed a romantic relationship (Us Weekly).

Lack of official confirmation

Both actors have declined to address the rumors. Craig went on to marry Rachel Weisz in 2011. The connection remains in the “rumor” column, not the confirmed one.

The catch: without confirmation from either party, this remains speculation rather than biography.

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

Oli Green’s birth year

Born in 1996, Oli Green is 15 years younger than Miller (born 1981) (E! News).

Precise difference

Reports consistently cite a gap of 14 to 15 years. By 2025, Miller was 43 and Green was 28 or 29. The age difference has attracted media attention but never public complaint from either partner.

Bottom line: The 15-year age gap is fact, not friction. Green told friends he was unfazed by the “celebrity spotlight” when they became a couple.

The pattern: the age gap has been a non-issue for the couple, who have focused on building a family.

What has happened to Sienna Miller?

Recent career moves

• Miller starred in Kevin Costner’s Horizon: An American Saga (2024) (E! News).
• She continues to front fashion campaigns and appear on magazine covers, including Vogue and British Harper’s Bazaar.

Personal milestones

• Welcomed second child in January 2024 with Oli Green.
• Debuted a baby bump at the 2025 Fashion Awards in London (Fox News).
• Engagement to Green was reported in June 2026 (People).

Public appearances

Besides the Fashion Awards, Miller has attended premieres and charity events while visibly pregnant, often photographed in sheer or boho-chic styles that reinforce her status as a style icon.

The implication: Miller has prioritized family over full-time acting while maintaining her public presence on her own terms.

Timeline: Sienna Miller’s life in dates

• 28 December 1981 – Born in New York City.
• 1998 – Begins modeling career.
• 2001 – First acting role in Keen Eddie (TV).
• 2004 – Breakthrough film Layer Cake.
• 2005–2007 – High-profile relationship with Jude Law.
• 2009–2011 – Relationship with Tom Sturridge.
• July 2012 – Birth of daughter Marlowe.
• 2014 – BAFTA nomination for American Sniper.
• 2021–present – Relationship with Oli Green.
• January 2024 – Birth of first child with Oli Green.
• December 2025 – Reveals third pregnancy at Fashion Awards (Vogue).
• June 2026 – Engagement to Oli Green reported (People).

The pattern: Miller’s career and personal life have evolved in parallel, with each decade bringing new milestones.

What’s confirmed, what’s still unclear

Confirmed facts

• Miller dated Jude Law from 2005–2007.
• Tom Sturridge is the father of Marlowe.
• She is in a relationship with Oli Green.
• She has two children (Marlowe and a child born 2024) and is pregnant with a third.
• She appeared at the 2025 Fashion Awards visibly pregnant.

What’s unclear

• Whether she had a romantic relationship with Daniel Craig (rumored only).
• Whether she and Bradley Cooper were ever romantic (both publicly deny).
• Exact name and birth date of her second child (not publicly disclosed).
• Whether the 2025 pregnancy will be her third child or second with Green (media reports count inconsistently).
• The exact date of Miller’s engagement to Oli Green (reported but not officially confirmed by the couple).

The catch: even with extensive media coverage, Miller keeps some details private and controls what becomes public.

Quotes from Sienna Miller and Tom Sturridge

“I’ve never cared about being a certain size. I just want to feel good in my own skin and be able to wear what I love.”

— Sienna Miller, Vogue (2024 interview)

“We’re a family. Marlowe is the center of our universe and we’ll always put her first.”

— Tom Sturridge, speaking about co-parenting with Miller (2023, as reported by People)

“I froze my eggs at 40. It gave me the freedom to take my time and not feel pressured.”

— Sienna Miller, The List (interview referenced in entertainment coverage)

Summary

Sienna Miller has built a life that balances high-profile romance, motherhood at different life stages, and an ongoing career. The pattern: she chooses partners outside the Hollywood machine, keeps her children’s details private, and uses her public appearances to reset the narrative. For a star who’s been tabloid fodder since her early 20s, the takeaway is clear: she now controls the story more than the headlines do. For anyone tracking celebrity motherhood, the implication is that Miller has quietly rewritten the rules — she became a mother at 30, again at 42, and is about to do it at 44, on her own timeline.

Related reading: Who is Oli Green? Sienna Miller’s boyfriend and children · Sienna Miller reveals baby bump at 2025 Fashion Awards

Her journey from modeling to motherhood is chronicled in Sienna Millers biography and family, which offers a thorough overview of her relationships and children.

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