Showing off her derriere in all its toned glory, the 40-year-old was the talk of the town at the Iron Man 3 premiere in LA.
Gwyneth looked completely unfazed by having her shapely bum on display through the frock's mesh side panels, even revealing a bit of side boob while she was at it.
She topped the Antonio Berardi optical illusion dress - which included a pulled-in peplum waist and mesh kimono sleeves - with a pair of towering Christian Louboutin heels.
But having just been named People's 'World's Most Beautiful Woman', Gwyneth was quick to shoot the title down, saying "it's wonderful" but "not true".
She said: "It's funny, these things, because it's like obviously not true, but it's very sweet to be named that.
"Because I mean you can't say that, you know, but it's been wonderful. It's been very wonderful.
"And as my friend said, it's so nice that someone who has kids and is a mum and is not, like, 21 is named that. It's really an honour. It's very sweet."
The actress has made no secret of her hard efforts to stay looking red carpet-ready, hitting the gym six times per week for two hours per visit. Hardcore.
Gwyneth also lives by a strict diet regime, eating no gluten, sugar or dairy and putting herself on detoxes before big events.
She came under fire recently after admitting that she doesn't give her children carbs, which she later admitted was more about gluten because her son suffers from eczema.
Gwyneth admitted: "What it is, is that my son [Moses] has very bad eczema and he's allergic to gluten and he's allergic to cow dairy.
"I try at home to make everything gluten-free for him because the difference in his comfort is unbelievable when he's sticking to what he's meant to be eating."
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