Keira Knightley and Natalia VodianovaAnything worse than having your boob pop out in public?

Yes - someone else wearing the exact same frock as yours.

Despite splashing loads of cash on stylists and the like, some celebs still end up wearing frocks worn by other famous faces.

And we've got the snaptorial evidence to prove it.

But the big question is: who wears it best?

Because even though we wish it was always a case of "one style suits all", often that ain't the deal at all.

What's good on one celebrity could be disastrous on another.

In short, a frock can go from fabulous to frightening in a matter of minutes.

Don't just take our word for it, though.

Rifle through our gallery of same-frock disasters below.