Sienna Miller does not have a husband—but she’s finally ready to walk down the aisle. The actress, 44, confirmed her engagement to actor and model Oli Green, 29, in June 2026, marking her fourth engagement but, if all goes to plan, her first marriage. The news came just weeks after the couple welcomed their second child together, capping off a whirlwind few years for one of Hollywood’s most private—and most talked-about—couples.
Here’s everything we know about Sienna Miller’s fiancé, their unexpected love story, and why this engagement might finally stick.
Who Is Oli Green, Sienna Miller’s Fiancé?
Oli Green is a British actor and model who has quietly built a career in both fashion and film. At 29, he is 15 years younger than Miller, a detail that initially gave the actress pause before she fell for him.
Green studied at the Lee Strasberg Theatre and Film Institute in New York and has appeared in projects including The Crown, The Mosquito Coast, and Bridget Jones: Mad About the Boy . On the fashion side, he’s fronted campaigns for Burberry and Gap, and in February 2025, he and Miller became the first couple to star together in a Frame denim campaign, photographed by Miller’s longtime friend Erik Torstensson.
Despite his growing profile, Green has largely stayed out of the spotlight that comes with dating one of Britain’s most famous actresses—a discretion that seems to suit them both.
How Sienna Miller and Oli Green Met
The couple’s origin story is refreshingly unglamorous. They met at a Halloween party in 2021, introduced by mutual friends. Miller wasn’t looking for a relationship, and she certainly wasn’t looking for a younger man.
“I didn’t expect to take it seriously and then quite quickly, I fell in love,” she told Harper’s Bazaar UK in 2024. “I wasn’t like, ‘I’m gonna get a younger boyfriend.’ It was more… ‘Why are you young? That’s so annoying’”.
Green, however, was persistent. Miller later told Vogue that after their initial meeting, “he worked hard to persuade me to go out for a drink with him”. She eventually agreed, and the rest is history.
The Engagement: A Ring, a Confirmation, and a Baby
Rumors of an engagement began swirling in early June 2026 when Miller was photographed in Barcelona wearing a large diamond ring on her left hand while casually strolling with her newborn strapped to her chest. The sighting came just weeks after she confirmed the birth of her third child—her second with Green.
E! News confirmed the engagement on June 9, 2026. Miller’s sister Savannah later told Hello! that the proposal was “beautiful” and that the family was “so over the moon”.
It was a fittingly low-key confirmation for a couple who have never courted publicity. As one friend told the Daily Mail: “Oli and Sienna are so ridiculously in love, they’ve got a lovely family and have such a giggle together. He knows what a catch Sienna is and wants to make her his wife”.
Sienna Miller’s Complicated Romantic History
To understand why this engagement feels different, it helps to understand Miller’s past. She has been engaged three times before—and has never made it down the aisle.
Jude Law: The One That Broke Her Heart
Miller’s most famous romance was with Jude Law, her co-star in Alfie. They began dating in 2003 when she was 22 and he was 31, and got engaged on Christmas Day 2004. The relationship imploded in 2005 when Law admitted to an affair with his children’s nanny.
The fallout was brutal. Miller later told The Daily Beast that she can’t remember six weeks of that period: “It was one of the most challenging moments I hope I’ll ever have to experience”. They briefly reconciled in 2009 before splitting for good in 2011.
Tom Sturridge: The Father of Her First Child
Miller dated actor Tom Sturridge from 2011 to 2015, and they welcomed daughter Marlowe in July 2012. The couple were reportedly engaged during their relationship, though they never married. They split amicably in 2015 and have co-parented successfully since.
Lucas Zwirner: A Brief Engagement
In 2020, Miller got engaged to author Lucas Zwirner after dating for about a year. The engagement was called off later that same year.
Why This Time Feels Different
Miller has spoken openly about how her relationship with Green differs from her past romances—and it comes down to generational differences in how men treat women.
“There is a difference in the way that generation of men respect women,” she told Harper’s Bazaar. “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”.
She also credits her own growth. After years of high-profile heartbreak and a period where she felt like she’d “wasted time” on the wrong people, Miller has found a relationship that feels both stable and joyful.
“Having had a baby at 29, and then having a baby at 42, and now 44,” she told Glamour, “it’s so much easier when you don’t have the conflict of feeling scattered and like you want to be doing X, Y, Z”.
Their Growing Family
Miller and Green have built a family quickly. They welcomed their first child together, a daughter, in January 2024. In December 2025, Miller revealed she was pregnant again by debuting her baby bump at the Fashion Awards in London. Their second child together arrived in May 2026, though the baby’s name and sex have not been publicly revealed.
Miller is also mother to Marlowe, now 14, from her relationship with Tom Sturridge.
In a rare moment of candor, Miller described the chaos of life with a toddler and a newborn: “I would have said the teenage girl would be harder to juggle until the transatlantic flight I took yesterday with the toddler and the newborn. The toddler now wins hands down. It was an absolute disaster. There’s no negotiating”.
Frequently Asked Questions
Is Sienna Miller married?
No. Sienna Miller is not married. She is engaged to Oli Green but has never been married, despite three previous engagements.
Who is Sienna Miller engaged to?
Sienna Miller is engaged to Oli Green, a 29-year-old British actor and model. Their engagement was confirmed in June 2026.
How old is Oli Green?
Oli Green is 29 years old. Sienna Miller is 44, making them 15 years apart in age.
How many children do Sienna Miller and Oli Green have?
They have two children together: a daughter born in January 2024 and a second child born in May 2026. Miller also has a 14-year-old daughter, Marlowe, from a previous relationship.
When did Sienna Miller and Oli Green start dating?
They met at a Halloween party in 2021 and began dating in early 2022.
Has Sienna Miller ever been married?
No. Despite being engaged four times—to Jude Law, Tom Sturridge (reportedly), Lucas Zwirner, and now Oli Green—she has never married.
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