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Big congrats to Sienna Miller -- the Brit queen just announced she’s pregnant at 43 with Baby Number 3 ... and naturally, she did it in the chicest way ever!

Sienna -- who’s expecting the child with actor Oli Green , their second together -- hit the 2025 Fashion Awards red carpet in London Monday night, rocking a sheer, lingerie-inspired white Givenchy gown that perfectly showed off that bump. Getty

The "American Sniper" star was posing away on the red carpet, looking angelic in her gown, which exposed not only her bump but also her white underwear.

Sienna first welcomed daughter Marlowe with ex Tom Sturridge back in 2012, and had her second daughter -- her first with Oli -- in January 2024. Getty

She’s also been open about freezing her eggs at 40 due to the pres

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