Kelly looked absolutely gorgeous as ever on the red carpet last night, however all eyes were drawn downwards by one very sheer dress.
However, it is a fab derriere so we're not surprised she decided to have it so on-show.
We reckon Kelly had some proving to do after she recently told Now magazine how she had been told Pippa Middleton's bum was better than hers.
Talking about her friend's wedding, the actress said: "I was chief bridesmaid and I was channeling Pippa Middleton all day but my bum apparently didn't look as good as hers."
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We find that hard to believe.
She continued: "I had a floaty dress on so I didn't have the right outfit for the bum she had."
Well, rest assured Kelly, we think last night's dress you might just have managed to finally beat Pip in the bum stakes.
So how can we get a bum as good as Kelly's?
She says: "I've been working out, riding my bike, going to the gym."
However, by the time we arrived at the film premiere's after party Kel had done a quick change, opting for a more demure red dress.
We wonder if she changed in the loos at the Odeon?
Probably not, actually.