It's Christmas, and you know what that means. It's time for masked serial slashers to reveal their true identities! The two-hour season finale of "Nip/Tuck" airs tonight at 10 p.m. and we have to admit, we're a little surprised that the season is already over. We suppose this is what you get when a network doesn't pad its seasons with repeat after repeat. (Not that we're complaining. We LOVE it when we get to......