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

SPARKLE & SHINE

Designer Lauren Conrad and former fellow The Hills star Stephanie Pratt make a stylish statement at the Hyde Bellagio celebration in Las Vegas, where Leona Lewis, Wilmer Valderrama and Eliza Dushku were among the revelers.