Sienna Miller Reveals Her Third Pregnancy at the 2025 Fashion Awards

She proudly unveiled her baby bump on the red carpet, hand in hand with her younger beau — but while the pregnancy reveal sparked celebration, it was her barely-there ensemble that left fans unimpressed and the internet in a tailspin.

She's already known for breaking hearts and headlines — and now Sienna Miller has set the internet ablaze yet again.

The 43-year-old actress, best known for her role in "Anatomy of a Scandal", made a show-stopping entrance at the Fashion Awards 2025 held at London's prestigious Royal Albert Hall on Monday, December 1 — and debuted her growing baby bump in spectacular style.

Yes, Miller is pregnant with her third child, and this time, the radiant star chose the glitzy awards night to reveal the news — arm-in-arm with her longtime partner, Oli Green.

The couple looked blissfully in love, walking the red carpet with a calm confidence — but it was Miller's jaw-dropping ensemble that had everyone talking.

'She Forgot to Get Dressed!' Fans Left Divided Over Her 'Nightie' Look

Miller's gown — an ethereal, almost see-through white creation — drew gasps from onlookers and unleashed a flurry of comments online.

The dreamy dress, crafted from sheer, flowing tulle, featured a structured bodice with defined cups, boldly contrasting with the delicate fabric that floated loosely over her belly. She paired it with soft, feathery pink heels and long, tousled waves, creating a look that was equal parts boho glamour and maternity chic.

But the internet wasn't sold.

"She looks like shes missing the top part of her dress [sic]," one viewer snapped. "Showing her knickers through the net curtain," another mocked. "They really don't leave anything to the imagination do they!!!" a third exclaimed in dismay.

Others compared her ensemble to sleepwear.

"She forgot to get dressed! Or was she ready for bed and forgot this engagement," one sniped. "Is she wearing her nightie !?" another chimed in.

Still, some fans defended the "American Sniper" star, praising her undeniable glow."She looks gorgeous so I'll let it go but please put clothes on," one wrote.

Who's That Man? Fans Mistake Boyfriend for Her Son

Standing beside Miller was her dashing 28-year-old partner Green, who turned heads in a tailored charcoal suit and relaxed cream shirt. But even his suave look wasn't enough to stop fans from wondering — who is he, really?

"I thought it's her son," an Instagram user wrote bluntly. "With her son or het boyfriend? 😂 [sic]," another echoed. Though the couple seemed unfazed by the noise, it's not the first time their 15-year age gap has sparked curiosity.

Second Child with Green, Third Overall — Sienna's Expanding Family

This new baby will be Miller's second child with Green, and her third overall.

She already shares daughter Marlowe with ex Tom Sturridge, whom she split from in 2015. Miller and Green also have a daughter together, whom they welcomed in early 2024, though they've kept details about their young child mostly under wraps.

In a heartfelt 2024 interview with Harper's Bazaar, Miller gushed about motherhood and her bond with Marlowe. "She's magical," she said. "It's amazing when you have these little people and there's a universe inside their heads."

Reflecting on co-parenting with Sturridge, Miller praised his intellect and depth, saying their daughter shares "this kind of comedy-jokester part of me and this intensity that comes from his brilliant mind."

'I Didn't Expect to Fall in Love' — Sienna on Her Younger Man

Miller first met Green at a Halloween party — and despite her initial reservations, romance bloomed fast. "I didn't expect to take it seriously and then quite quickly, I fell in love," she revealed.

She admitted being surprised by their age difference, joking:

"I wasn't like, 'I'm gonna get a younger boyfriend.' It was more, '[Expletive]! Why are you young? That's so annoying.'"

But age turned out to be a soothing balm rather than a barrier. "There is a difference in the way that generation of men respect women," she said. "It's specific to him, he is very wise and well-adjusted, but I do believe it's also that generation."

'It Was a Slightly Belittling Time': Sienna Opens Up About Her Past

In a raw moment, Miller reflected on the era she came of age in — when male predatory behavior was often normalized in the entertainment industry.

"I could talk myself into all sorts of shapes to make the men in the room feel comfortable," she said. "And God forbid that you offend a man's ego by rejecting them. It was a slightly belittling time."

She praised the younger generation for being more empowered:

"It's interesting, being older now [...] learning from people who are younger about how clear they are in their boundaries [...] having 'no' in the repertoire in a way that we just weren't encouraged to have."

Mama, Movie Star, and Red Carpet Rebel — Sienna Isn't Slowing Down

From mom-of-three to fearless fashionista, Miller continues to captivate and challenge expectations. Whether it's her choice of partner, parenting style, or red carpet wardrobe, the actress refuses to be boxed in — and that's exactly why people can't stop talking.

Love her or loathe her daring look — one thing's for sure: she knows how to steal the spotlight.