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Sienna Miller is adding one more to her famous family.
The British actress subtly revealed at the 2025 Fashion Awards that she is expecting her third baby, her second child with partner Oli Green.
Ahead of her third bub’s arrival, get to know her kids here and how she feels being an older mum in her 40s.
Who is Sienna Miller’s partner?
Sienna Miller is currently in a relationship with actor and model, Oli Green.
Though they were seen leaving the 2022 BAFTA Film Awards together, they didn’t make it red carpet official until the Vanity Fair Oscar Party that year.
Despite being 15 years older than her beau, Sienna told Harper’s Bazaar in 2024 that Oli is “very wise” for his age.
“Quite quickly, I fell in love. I wasn’t like, ‘I’m gonna get a younger boyfriend.’ It was more, ‘F–k! Why are you young? That’s so annoying’.
“There is a difference in the way that generation of men respect women. It’s specific to him, he is very wise and well-adjusted, but I do believe it’s also that generation. They have grown up with a slightly more level playing field. I see it in his female friends as well as in the men.”
Who has Sienna Miller dated?
Arguably Sienna’s most high-profile relationship was with her ex-fiancé, Jude Law.
In 2005, the couple made headlines when news broke of Jude’s affair with his children’s nanny but Sienna told The Daily Beast that “there’s a whole six weeks of that experience that I don’’t remember”.
“I’d really just begun. I was only 23. But if you get through that, you feel like you can get through anything,” she told the publication in 2020.
Sienna then dated actor Tom Sturridge between 2011 to 2015 with whom she shares daughter, Marlowe. Though they have since ended their relationship, Sienna and Tom have remained friends and continue to co-parent.
How many children does Sienna Miller have?
The actress became a parent back in July 2012 when she and her ex Tom Sturridge welcomed daughter, Marlowe.
Whilst she and Tom, who split after four years together in 2015, co-parent Marlowe, Sienna has since welcomed a daughter with her current partner, Oli Green whose identity they have kept out of the public eye. Their third child is due in 2026.
Speaking to Vogue when Marlowe was only 10-years-old, Sienna explained how her eldest daughter has carved out her own “sense of self and style”.
“Mine was much more eclectic. Hers is cool and really chic and quite 90s,” the proud mum told the publication, adding that Marlowe loves the “clean girl aesthetic”.
“I’ve lost a lot of hoodies, but I steal her clothes, too. Her little T-shirts are quite sweet over a vest and her jumpers are really nice and cropped,” she added.
Fans were delighted when Marlowe joined her mum on the red carpet at the 2024 Cannes Film Festival.
Whilst Sienna and Oli have chosen not to share too many details about their second child, the actress admitted in 2024 that having a new sibling took some adjusting for Marlowe.
Chatting to E! News at the LA premiere of Horizon: An American Saga when her second baby was just six-months-old, Sienna confessed, “Initially, it was a lot for her and now she is in heaven.”
The proud mum also revealed that her then-newborn was “already idolising” Marlowe and “beaming every time she sees her”.
“Now that the baby can react,” Sienna said, “[she] is clearly in love with her big sister.”
Being an older mum
When she welcomes her third child, Sienna will be 44-years-old and has spoken about having kids in her forties.
The actress admitted to ELLE in 2022 that she felt pressure about having more kids in her twenties and thirties.
“Biology is incredibly cruel on women in that decade – that’s the headline, or it certainly was for me. Then I got to 40 and I froze some eggs. Having been really focused on the need to have another baby, I’m just like, if it happens, it happens. That kind of existential threat has dissipated,” she told the publication.
How has motherhood changed Sienna Miller?
In her chat with Vogue, Sienna explained how becoming a parent put her life into perspective.
“You become aware that someone is just infinitely more important than you ever are and that is incredibly relieving,” she said. “I think it was the first time that I suddenly did the math on what life was and I’m grateful for that because it makes you treasure each moment.”
But despite being a celebrity, motherhood has had its challenges and the actress opened up about how she reminded her friends that it’s ok to find the adjustment into the new life stage challenging.
“When I had a baby, nobody had been particularly honest about how hard that first part is, and I felt like a failure for feeling like it was difficult.”
