Sienna Miller and Oli Green Are Engaged! Actress Confirms Whirlwind Year After Welcoming Second Baby

It's been quite the year for Sienna Miller. The British-American actress, 44, is officially engaged to her boyfriend Oli Green — and if the rock spotted on her finger during a sun-soaked stroll in Spain is anything to go by, he's not doing things by halves.

E! News confirmed the news on 4 June, after eagle-eyed observers clocked a dazzling diamond ring on Miller's left hand during an outing in Spain. Green, 27, was by her side as she walked with her hands held delicately in front of her — almost as if she wanted the world to see it. Which, frankly, who could blame her?

The engagement caps an extraordinary run of milestones for the couple, who first got together in 2022. Just last month, they confirmed the arrival of their second child together, making Miller a mother of three — she also has 13-year-old Marlowe from her relationship with ex Tom Sturridge.

Miller made the sweet admission to E! News shortly after the birth, sleep-deprived but clearly smitten. Green, best known for his role in The Crown, has been very much part of the picture throughout.

Of course, life with a newborn and a toddler in tow is rarely glamorous — even for Hollywood's most stylish. Miller gave a brilliantly candid account of the realities of new motherhood during an appearance on The Tonight Show in May, admitting that a recent transatlantic flight with her younger two had pushed her to the absolute limit.

"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. "The toddler now wins hands down. It was an absolute disaster. There's no negotiating."

She went on to describe the sheer indignity of the experience. "The looks people give you on the flight — the baby's screaming, she's screaming," Miller recalled. "I got to the immigration line and just broke down."

Miller and Green's 17-year age gap has raised eyebrows in some quarters, but the American Sniper star has been refreshingly open about why their relationship works so well — and why she's actually changed her thinking on dating younger men altogether.

Speaking to Harper's Bazaar in 2024, she was thoughtful on the subject: "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."

It's the kind of comment that's sure to spark a debate — but then, Miller has never been one to shy away from saying exactly what she thinks. With a new baby, a newly expanded family and now a ring to match, it seems like life has rarely looked better for one of Britain's most enduring stars. Watch this space for the wedding news.