New Year's Eve

New Year's Eve Party Stars

From N.Y.C. to Sin City, see how Gaga, Fergie, Rihanna and more popped the cork on 2012

QUITE A CONTRAST!

Also partying at the Hyde Bellagio, a white-hot Sofia Vergara strikes a pose with a darkly dressed Joe Jonas – but was he as entertaining as Kermit the Frog?