Oli Green proposed to Sienna Miller during a walk in Central Park, and she had no idea it was coming. She was still recovering from giving birth to their second child a few weeks earlier, and she joked on national television that she was not looking her best. On September 24, 2026, Miller finally told the story on The Tonight Show, and the British actor behind it became one of the most searched names in entertainment.
Who Is Oli Green, Sienna Miller's Fiancé?
Oli Green is a British actor, model, and occasional producer who spent years working steadily without much tabloid attention. He is best known on screen for a small but memorable turn as Kate Middleton's ex-boyfriend in The Crown, and for a role in the 2025 film Bridget Jones: Mad About the Boy. Off screen, he has been Sienna Miller's partner since early 2022, and the two are now engaged and raising two young children.
Oli Green's Age and Background
Oli Green's age is 29, according to Us Weekly's coverage and September 2026 reports on the engagement. His exact birth date and hometown have not been widely published in reliable sources, so those details are best treated as unconfirmed. What is documented is that he is roughly 15 years younger than Miller, who is 44.
Oli Green's Acting Career: The Crown, Bridget Jones and More
Oli Green's career began with a 2019 music video for John Eatherly's song Burnout, where model and actress Kaia Gerber played his love interest, per Elle. Since then, he has built a résumé that includes A Good Person, Lift, The Gray House, and The Mosquito Coast.
His best-known television credit is the sixth season of The Crown, where he played Rupert Finch, Kate Middleton's ex-boyfriend, across two episodes in 2023. In 2025, he appeared in Bridget Jones: Mad About the Boy as a checkout worker. He also produced a short film, Marion, in 2024, which shows he has interests beyond acting.
How Oli Green and Sienna Miller Met
The two met at a mutual friend's Halloween party in 2021 and shared a kiss that night. Miller has said her first instinct was to write it off. "This is absurd. This will not go anywhere," she told British Vogue, according to The Independent. Green then persuaded her to go for a drink, and the relationship grew from there.
Oli Green and Sienna Miller's Relationship Timeline
They were first photographed together in February 2022, and they made their red carpet debut at the Vanity Fair Oscar Party that March. Green later supported Miller at the Cannes premiere of Horizon: An American Saga.
Miller has been open about how the relationship changed her thinking. She said in a 2024 Harper's Bazaar interview that Green is wise and well-adjusted, and that men of his generation grew up with a more level playing field.
Oli Green and Sienna Miller's Children
The couple's first child, a daughter, was confirmed in early January 2024, when the two were photographed with the newborn in West London. Miller announced her second pregnancy at The Fashion Awards in London in December 2025.
Their second child, a son, arrived on May 11, 2026. Miller told E! News about the birth with obvious joy. "I have a tiny baby next door," she said. Miller is also mother to Marlowe, 13, from her relationship with Tom Sturridge.
Oli Green Proposes to Sienna Miller in Central Park
Engagement rumors began on June 4, 2026, when Miller was photographed in Spain wearing a large diamond ring on her left hand. E! News confirmed the engagement on June 9, as Just Jared reported, less than a month after the baby was born.
Miller shared the details on The Tonight Show, according to myTalk 107.1. She said they "went for a walk in Central Park" when Green popped the question, and that she had no idea he was planning it.
Oli Green and Sienna Miller's Age Gap
The age difference has been a public talking point since the start. Miller said the gap made her hesitant at first, and she has spoken about how it "cuts both ways" for both of them. Her point in interviews has been that the disparity between how society views older women with younger men and the reverse is still unfair.
Oli Green's Net Worth
Oli Green's net worth has not been publicly disclosed. His income comes from acting, modeling, and producing work, none of which has produced a verified figure. Any number that appears online is an estimate rather than a fact.
Oli Green in 2026
As of late September 2026, Green is engaged to Miller and raising two young children with her. No wedding date has been announced. He has largely let Miller speak for the couple, which fits the quiet way he has handled his career.
Oli Green Quick Facts
| Detail | Information |
|---|---|
| Full Name | Oli Green |
| Age | 29 |
| Profession | Actor, model, producer |
| Known For | The Crown, Bridget Jones: Mad About the Boy, A Good Person, Lift |
| Partner | Sienna Miller (together since early 2022) |
| Engaged | June 2026 (confirmed June 9) |
| Proposal | Central Park, New York |
| Children | A daughter (early 2024) and a son (May 11, 2026) |
| Net Worth | Not publicly disclosed |
Frequently Asked Questions
Who is Oli Green?
Oli Green is a British actor and the fiancé of actress Sienna Miller. He played Kate Middleton's ex-boyfriend in The Crown and appeared in Bridget Jones: Mad About the Boy.
How old is Oli Green?
Oli Green is 29. Sienna Miller is 44, which makes the age gap about 15 years.
How did Oli Green propose to Sienna Miller?
He proposed during a walk in Central Park in New York, and Miller has said she had no idea it was coming.
How many children do Oli Green and Sienna Miller have?
They have two children, a daughter born around the start of 2024 and a son born on May 11, 2026.
What is Oli Green's net worth?
No verified figure has been published, and any number found online is an unconfirmed estimate.