Sienna Miller was born on December 28, 1981, in New York and grew up in London before becoming one of the defining It girls of the early 2000s. Today, at 44, her life looks very different. She is now a mother of three and in a relationship with a man 15 years younger than her — a new chapter marked by confidence, calm and a very different kind of happiness than the whirlwind years of her twenties.
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Sienna Miller and the Man 15 Years Younger Than Her
Since late 2022, Miller has been dating British actor and model Oli Green, who was born in 1997. The relationship initially surprised many fans because of their 15-year age gap, but it quickly grew serious.
In November 2023, the couple welcomed their first daughter together, though they chose to keep her name private. Two years later, in December 2025, Miller revealed she was expecting again while attending the Fashion Awards at London’s Royal Albert Hall in a sheer white Givenchy gown that proudly showcased her baby bump.
What stood out was not just the pregnancy announcement itself, but the way Miller embraced it openly and confidently. Rather than hiding her changing body, she celebrated motherhood publicly — something she had already done during her earlier pregnancy in 2023.
Her Honest View on Motherhood at 44
In a candid 2026 interview with Glamour, Miller reflected on how different motherhood feels in her forties compared to her late twenties.
“Having had a baby at 29, and then having a baby at 42, and now 44, it's so much easier,” she explained. “When you don’t have the conflict of feeling scattered and like you want to be doing X, Y, Z,”
Her words resonated with many women because they challenged the outdated idea that later motherhood is something limiting or difficult. Instead, Miller described it as grounding and deeply fulfilling.
At 44, she says she feels more certain of herself, her priorities and the life she wants to build — a perspective shaped by years of career highs, heartbreaks and personal growth.
Three Daughters and a Modern Family
Miller’s eldest daughter, Marlowe, was born in 2012 during her relationship with actor Tom Sturridge. Although the couple separated in 2015, they have remained close and continue to co-parent.
Today, Miller has three daughters: Marlowe and two younger girls with Oli Green. According to Miller, becoming a big sister was initially overwhelming for Marlowe, but the bond between the siblings quickly grew strong.
“She’s in heaven now,” Miller shared in an interview with E! News, explaining that the younger children “beam” whenever they see their older sister.
The result is a modern blended family built less around public appearances and more around warmth, closeness and everyday moments together.
A Career That Never Slowed Down
Even while embracing motherhood again, Miller has continued to expand her acting career. She recently appeared alongside Kevin Costner in the western epic Horizon: An American Saga and stars in the upcoming action thriller Jack Ryan: Ghost War, set for release on Amazon Prime Video in 2026.
Much of the project was filmed before her latest pregnancy — another sign that Miller no longer sees motherhood and ambition as opposing forces.
Unlike the tabloid-driven years of her twenties, today’s Sienna Miller appears far more in control of both her career and private life. The headlines no longer define her. Instead, she seems focused on building a life entirely on her own terms.
A Different Kind of Happy Ending
There is something quietly powerful about the chapter Miller is living now. Once one of London’s most photographed and scrutinized celebrities, she now speaks more about family, balance and peace than fame.
Perhaps that is the most unexpected twist in her story: the woman once chased relentlessly by tabloids now finds her greatest joy at home with a newborn in her arms.
Sometimes, the happiest chapter begins much later than expected — and for Sienna Miller, that chapter may only just be starting.
