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Of course we always enjoy seeing celebrities abandon their red carpet personas and let loose, but when they start emerging from nightclubs barely standing and sporting lipstick marks on their collarbone, we start to worry. After obediently posing for pictures at last night's premiere of Leatherheads in London, Renee Zellweger dove bob first into the party scene alongside a better-behaved George Clooney. And, as these pictures show, Zellweger may have downed one too many pricey cocktails across the pond.

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Renee made yet another tight-lipped and prim appearance for the photographers on the carpet, but couldn't quite stay balanced leaving the after-party in Mayfair. Looks as though she even needed the assistance of far-meatier arms to make it to her ride intact.

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Once inside her car, we catch a glimpse of a very Britney Spears-esque lipstick stain on her neck. We don't know which is more disturbing: the possibility that Renee partook in some girl-on-girl action or that she got so drunk she nodded off and stained herself.

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Either way, we are happy she appeared to make it home in one "squiffy" and "tiddly" piece.

[Photo Credits: Isoimages, Big Pictures, Matrix, Wireimage via The Daily Mail]