After four years together, Sienna Miller and Oli Green are officially headed down the aisle.
A representative for Miller confirmed to Vogue that the couple are engaged, bringing an end to days of speculation after the actress was photographed wearing a striking diamond ring while on holiday in Spain.
The engagement rumours began on June 4, when Miller stepped out in Barcelona wearing what appeared to be a sizeable solitaire diamond on her left hand. In photos published by Who What Wear, the actress paired the sparkling new addition with a semi-sheer black blouse, a snakeskin trench coat, relaxed denim and strappy black sandals.
Ernesto Buono, founder and master jeweller at Ernesto Buono Fine Jewellery in Sydney, believes Miller’s ring appears to be a classic solitaire design featuring a round brilliant-cut diamond of approximately 1.5 carats.
While only limited photos of the ring have surfaced so far, Buono estimates its value at around $50,000, though he notes the final figure could be higher depending on the diamond’s quality, including its cut, colour and clarity, as well as the craftsmanship of the setting.
The couple, who first sparked romance rumours in 2022, now share two children together. Miller welcomed their first daughter in December 2023, before giving birth to their second child in May 2026. The actress is also mother to 13-year-old daughter Marlowe, whom she shares with actor Tom Sturridge.
News of the engagement comes amid a particularly busy chapter for Miller, who recently opened up about life as a mother of three.
“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,” she joked during an appearance on The Tonight Show in May. “The toddler now wins hands down. It was an absolute disaster. There’s no negotiating.”
Earlier this year, Miller also spoke candidly about the public scrutiny surrounding her relationship with Green, who is 15 years her junior.
“The idea of an older woman with a younger man, for example, is still fetishized rather than normalized,” she told Grazia in March. “There’s a disparity there that I would love to see disappear.”
At the time, Miller was pregnant with the couple’s second child. Two months later, she confirmed the baby’s arrival while speaking to E! News.
“It’s happened. I have a tiny baby next door,” she said. “It feels like stringing sentences together is a bit challenging. I’m on very little sleep but I’m madly in love with my baby.”
The pair have largely kept their family life out of the spotlight, revealing few details about either of their children. But those close to the couple have long spoken warmly about their relationship. Speaking to Vogue, Emily Blunt described Green as sharing many of the qualities that make Miller so beloved.
“I see so much of her in him,” Blunt said. “That free-spirited, curious, guileless thing that he has. He’s the kind of guy you could just bring anywhere, and everyone would love him.”
