Stars' New Year's Parties!

Toast 2010 with Christina Aguilera, Nicole & Joel, Lauren Conrad and more Hollywood dazzlers

POP STAR

At her New Year's Eve concert in New York's Madison Square Garden, Mariah Carey toasted 2010 with a glass of Champagne and a very special guest: husband Nick Cannon, who manned the deejay platform and ended the set by kissing his wife (not pictured).