Pamela Anderson slipped up on the catwalk at Vivienne Westwood's Paris Fashion Week show in France on Friday, when a wardrobe malfunction left her baring a breast.

The busty mom of two was rehearsing for a runway show when her left nipple popped out of her top.

Giggling Anderson quickly covered up and carried on modeling the British designer's wares without a hitch.

A catwalk watcher tells WENN, "It was hilarious and Pam didn't seem to mind a bit that everyone had seen more than they were supposed to. I guess when you've bared all for sex tapes and magazines, something like this is nothing."