The plot is both feeble and ridiculous, but this still delivers more than its fair share of laughs, thanks to terrific comic performances from Kutcher, Diaz and supporting players Rob Corddry and Lake Bell.

With a script that only barely hangs together by the skin of its teeth, this romantic comedy survives on the considerable charm of its terrific cast.

ena Tzak Pot sta klise poy paradoksos leitoyrgei anapanteha apotelesmatika, kyrios hari stin yperballoysa karikatoyristiki apeikonisi ton haraktiron poy se stigmes ftanei to anegkefala ksekardistiko kai sti himeia toy zeygoys ton ermineyton

What happens in this seriously flawed would-be romantic comedy is Nothing Much.

It's less obnoxious than Fool's Gold, less forced than Made of Honor and less formulaic (well, by a sliver, anyway) than 27 Dresses.

Should have stayed elsewhere in the state of Nevada. How about those mountains where they are supposed to store the nuclear waste?

Ultimately, What Happens in Vegas resembles a drunken night in Sin City; when it's over, you don't really remember what happened except that it wasn't good.

Diaz and Kutcher restore the original, ebullient meaning of 'sex comedy'. They’re fun to watch, which is a rare thing in this Zellweger, Clooney, Kidman, Gosling, Apatow world.

This film is not the equivalent of brain surgery, but it is entertaining.