Sienna Miller and Oli Green are taking the next step in their relationship after welcoming their second baby together.
Miller, 44, initially sparked engagement rumors when she was spotted wearing a diamond ring on her left hand in Spain on Thursday, June 4. E! News later confirmed that the jewelry is an engagement ring.
Us Weekly reached out to reps for Miller and Green for comment.
For the outing on Thursday, Miller wore jeans and a black shirt with a jacket around her shoulders. She styled the look with a pair of black sunglasses, placing her hands in front of her with the ring on full display.
Miller previously revealed at the British Fashion Awards in December 2025 that she and Green, 29, were expecting their second baby together. In May, Miller confirmed that she had given birth.
“It’s happened,” Miller said in an interview with E! News at the time. “I have a tiny baby next door.”
Miller, who also shares daughter Marlowe with ex Tom Sturridge, explained that the transition from two kids to three has been an adjustment.
“It feels like stringing sentences together is a bit challenging,” she teased. “I’m on very little sleep, but I’m madly in love with my baby.”
Miller welcomed her eldest daughter in 2012, splitting from Sturridge in 2015. Miller was first linked to Green in 2022. Two years later, the Daily Mail broke the news that Miller and Green welcomed a daughter, whose name has been kept private.
In 2024, Miller made a rare comment about her bond with Green — who is 14 years her junior — during an interview with Harper’s Bazaar.
“I didn’t expect to take it seriously,” she recalled of her initial impression of their relationship. “And then quite quickly, I fell in love.”
Miller also revealed her reaction to learning Green’s age.
“I wasn’t like, ‘I’m gonna get a younger boyfriend,’” she recounted. “It was more, ‘F***! Why are you young? That’s so annoying.’”
Despite the age difference, Miller gushed that she and Green are very compatible.
“There is a difference in the way that generation of men respect women,” she explained. “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.”
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