Stars' New Year's Parties!

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

WHEN IN VEGAS ...

From the turntables to the mic, Pete Wentz celebrated rock-star style (tattoos and all!) at JET nightclub at The Mirage – but it seems he had something else on his mind, Tweeting: "Missing @ashsimpsonwentz in town."