Sienna Miller is officially pregnant again, and yes, it’s baby number three overall and her second child with current boyfriend Oli Green — and she chose the 2025 Fashion Awards red carpet to drop the news in the most Sienna way possible: a sheer white dress and a very visible bump.
Sienna Miller: Third Pregnancy, Same Effortless Chaos
Using “sienna miller” as the main keyword here, the basics are clear: the 43-year-old actress is expecting her third child, and it’s her second baby with 28-year-old actor-model boyfriend Oli Green. She already shares:
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A 13-year-old daughter, Marlowe, with ex Tom Sturridge.
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A younger daughter, born at the end of 2023/early 2024, with Oli Green (whose name Sienna has kept private so far).
Sienna quietly stepped back from the spotlight in recent months, and now the reason’s out: she was waiting for that perfect fashion moment to reveal bump number three at London’s Royal Albert Hall during the 2025 Fashion Awards. She walked the carpet in a sheer, floaty white Givenchy look over white shorts, with loose waves and statement earrings, turning a pregnancy reveal into a runway moment.
Boyfriend, Babies, and That Age-Gap Romance
Sienna Miller and Oli Green have been together publicly since 2022, and their relationship has been a mix of low-key and very photogenic: Wimbledon, fashion shows, red carpets, and now a growing family of four. There’s a 15-year age gap between them (she’s 43, he’s 28), and Sienna has openly said that while people love to talk about it, Green is “wise for his age” and she’s comfortable in the relationship.
Key things people usually want to know:
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How many kids does Sienna Miller have? Three: Marlowe with Tom Sturridge, one daughter with Oli born in 2023/24, and this new baby on the way with Oli.
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Are Sienna Miller and Oli Green married? No reports or official confirmation of a marriage yet — they’re publicly referred to as boyfriend/girlfriend or partner.
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When did she reveal this pregnancy? On December 1, 2025, on the red carpet at the 2025 Fashion Awards in London.
Sienna Miller and Motherhood After 40
Sienna Miller has been very candid about what it’s like navigating fertility and motherhood in her 40s. In a past interview, she revealed she froze her eggs in her late 30s after feeling intense pressure about “running out of time,” and later talked about how that lifted some of the anxiety around whether she’d have more children.
Her third pregnancy, and second with Oli Green, fits into that bigger story she’s been quietly telling:
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She’s spoken about how “biology can be harsh” on women in their late 30s and early 40s, and how the social pressure to have kids by a certain age weighed on her.
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She’s also been honest about insecurities around being an older mom while still being in an industry obsessed with youth and appearance.
Now, Sienna miller is clearly leaning into this new chapter: three kids, a younger partner, and a very public, very stylish pregnancy reveal that doubles as a quiet statement that women over 40 can still shape their own timelines.
