“I’m on very little sleep but I’m madly in love with my baby,” Miller says.

Sienna Miller, 44, welcomes her third baby, second with younger boyfriend Oli Green: ‘It happened’

"I’m on very little sleep but I’m madly in love with my baby," Miller says.

By Leigh Blickley

May 11, 2026 11:56 a.m. ET

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- Sienna Miller is now a mom of three.

- She recently welcomed her third baby, her second with Oli Green.

- She also shares 13-year-old daughter Marlowe with ex Tom Sturridge.

Sienna Miller has added a new member to her brood!

The actress, 44, gave birth to her third child — her second with boyfriend Oli Green.

"It’s happened," Miller said during an interview with *E! News*. "I have a tiny baby next door."

Miller confirmed she and Green, 29, were expecting another little one at the 2025 Fashion Awards in London, England, in December as she walked the red carpet in a sheer white dress. She and Green share a 2-year-old daughter and Miller also has a daughter Marlowe, 13, with ex Tom Sturridge.

"It feels like stringing sentences together is a bit challenging,” Miller joked to *E! *of adjusting to life as a mom of three. "I’m on very little sleep but I’m madly in love with my baby."

** has reached out to Miller's rep for more details.

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Miller previously ended an engagement to Jude Law amid a cheating scandal in 2006. They reconciled in 2009 but split for good in 2011. Miller then moved on with Sturridge, whom she dated for four years until 2015. She then had a brief engagement to art businessman Lucas Zwirner in 2020 before making things official with fellow actor Green in 2022.

She defended their 15-year age gap in an interview with *Harper's Bazaar* in 2024, saying she didn't expect to take her relationship with Green seriously at first.

Oli Green and Sienna Miller in December 2025.

Lucy North/PA Images via Getty

"I wasn’t like, 'I’m gonna get a younger boyfriend.' It was more, 'F---! Why are you young? That’s so annoying,'" the *Tom Clancy's Jack Ryan: Ghost War* star said at the time.

She added, "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. I see it in his female friends as well as in the men."

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Miller also spoke of May-December romances in a recent interview with *Grazia*.

"I remember being 21 and auditioning to be the love interest of a 45-year-old man,” she said in March "Things have moved on since then, but the idea of an older woman with a younger man, for example, is still fetishized rather than normalized — there’s a disparity there that I would love to see disappear."

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Source: “EW Celebrity”