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British besties Kate Moss and Lily Allen got wet and wild off a boat in St. Tropez yesterday, taking flying leaps off the ship into the sea.

Lily looked dramatically slimmer, in a strapless bikini that showed off her recent weight loss - which, according to the Daily Mail is due to some diet advice from Kate Moss!

I know what you're thinking, but it's not that kind of diet - although it doesn't sound much healthier! According to a source, "Kate's been telling her to try the 'rock chick' diet - coffee, cigarettes, vodka and champagne, which are relatively low in calories." Mmm, sounds like breakfast to me!

And although both girls have quite the reputation, this time it was strictly PG, as Kate's daughter Lila Grace, 6, was on deck as well.

Ok, maybe more like PG-13:


Click through for the uncensored version!