rundown
Sienna Miller and Oli Green have been dating since 2022. “I didn’t expect to take him seriously, but I fell in love with him right away,” Miller previously revealed. The couple has one daughter, and in December 2025 she announced that she was pregnant with her second child.
Sienna Miller has been dating Oli Green, who has been reported to be dating since the winter of 2022, and they have even started a family together.
Prior to Green, Miller dated fellow actor Tom Sturridge and gave birth to their daughter, Marlowe Sturridge, in 2012. In a June 2024 cover story for Harper’s Bazaar UK, Miller revealed that she and Tom remain friends and are working together to raise their daughter.
“She’s magical,” Miller said of Marlowe. “It’s great to have these little people and have a universe inside their heads. Her father is incredibly intelligent, but he’s also a very deep person. And she straddles the comedic, jokey side of me and this intensity that comes from his brilliant mind.”
Miller currently has a daughter with Green and announced in December 2025 that she was pregnant with their second child. Here’s everything you need to know about actors Oli Green’s relationship with Sienna Miller.
Mr. Green is also an actor.
Miller isn’t the only actor involved in the relationship. Green has appeared in Bridget Jones: Mad About the Boy, The Crown, The Good Person and The Rift.
According to his IMDb page, his first gig was in the music video for John Eatherly’s “Burnout” in 2019. Model and actress Kaia Gerber played his girlfriend.
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Green and Miller first started dating in February 2022.
It’s unclear exactly when the actor couple started dating, but rumors of a romance sparked in early February 2022 when they were spotted at a New York Knicks vs. Memphis Grizzlies game at Madison Square Garden. Page Six obtained a photo of Green with her hand on Miller’s shoulder as they walked together.
In March of that year, the two were spotted together again. The Daily Mail shared a paparazzi photo of Miller and Green sitting in the back seat of a car as they headed to an after-party after the BAFTAs.
Miller and Green have one child together.
In January 2024, People reported that the couple welcomed their first child, a girl.
People first reported that Miller was pregnant in August 2023, when she showed off her pregnant belly in a brown bikini in Ibiza.
When she was about 32 weeks pregnant, Miller and Green went on a “babymoon,” Miller later told the Times. She said her “pregnancy is going well” and that she is “ready to travel far away.” They decided to go to the Maldives, and Miller recalled her experience, including the resort staff welcoming her with a “Welcome to the Babymoon” sign and a baby-shaped cake.
This was Miller and Green’s first trip as a couple.
“When Oli and I were preparing for our trip, we realized that in all our years together we had never actually spent a holiday together, so it was really magical to spend that time together, thinking about each other and our baby-to-be,” she concluded.
She previously appeared on ELLE in 2022 She told UK: “The pressure… why you should have a baby, why you shouldn’t have a baby, all of that is really loud noise. Biology was incredibly cruel to women for that 10 years. That was the headline, and it certainly was for me. Then I turned 40 and froze some eggs. I was seriously thinking about the need to have another baby, so if it’s going to happen, it’s going to happen. Something like that.” The existential threat is gone. ”
Miller opened up about his relationship with Green in June 2024.
In an interview with Harper’s Bazaar UK, Miller shared a personal story about his largely private relationship with Green. She explained that she never expected to fall in love with the 28-year-old actor, who is 14 years her junior, after meeting him for the first time at a Halloween party.
“I didn’t expect to take it seriously, but I fell in love with it right away,” she recalls. “I wasn’t thinking, ‘Let’s get a younger boyfriend.’ It was more, ‘Shit! Why are you younger? That’s so annoying.’
However, their relationship works well despite the age difference.
“There’s a difference in the way men of that generation respect women. It’s specific to him, and he’s very wise and well-adjusted, but I believe it’s also that generation. They’ve grown up on a bit more of a level playing field, and you see that in not only the men but also his female friends,” Miller explained.
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Green and Miller will make their red carpet debut in 2022.
Miller and Green walked the carpet together for the first time as a couple at Vanity Fair’s Oscar Party in March. The actress wore a champagne-colored satin dress with a cutout at the waist and embroidered crystals on the bodice. Green posed next to her in a navy blue pinstripe suit and tie.
Since then, they have participated in several events together.
Green supported Miller at the premiere of Miller’s film Horizon: An American Saga at the Cannes Film Festival. The actress made it a family affair, bringing along her daughter Marlowe Sturridge and mother Josephine Miller, and the four posed for photos together on the red carpet.
In some photos, Green and Sturridge were seen walking hand in hand outside the Carlton Hotel, all dressed up and ready to go to the event.
At the end of the night, Miller, Green, and Sturridge headed to the Lucia Cannes afterparty for Horizon: An American Saga.
In April 2023, they attended the Prince’s Trust Gala together. Miller wore a sheer nude dress with intricate sparkling embellishments and a pink tulle cape that spilled down her back. Meanwhile, Green was wearing a navy blue pinstripe suit, with a white shirt underneath partially undone.
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Green and Miller are expecting their second child.
In December 2025, Miller announced that she was expecting her second child with Green while showing off her baby bump at the London Fashion Awards. On this occasion, the couple walked the red carpet together and she wore a white sheer dress.
Learn more about Sienna Miller
