Adam Lambert rocked out on stage.
Jennifer Lopez let it all hang out in an embarrassing skintight bodysuit.
How did other celebrities ring in the new year? Lindsay Lohan headed to St. Bart's, Fergie made out with Josh Duhamel and everyone seemed to be in the holiday spirit.
See what we mean below. Click on the following photos to see how various stars celebrated the start of 2010...
From stars of The Hills to Pamela Anderson's enormous hills, everyone came out to party last week. [Photos: Splash News, Pacific Coast News]