Aguilera and Jordan Bratman celebrate her birthday with a Clockwork Orange-themed West Hollywood bash. Plus: Jen & John, Kanye West, Robert Pattinson, J.Lo and more

SEASON'S GREETINGS

Leighton Meester is festively attired – check out her red coat! – on the set of Gossip Girl Thursday on New York's Upper East Side. New episodes of the CW show resume on Jan. 5.