Michael Buckner/Getty Images
After the the Killers delivered a killer performance at the Coachella Music and Arts Festival in Indio, Calif., stars partied the night away at the T-Mobile G1 Tone-Def party.
Paris Hilton and her boyfriend, Doug Reinhardt, drank and danced with Paris' sister, Nicky Hilton, and her bf, David Katzenberg. At one point, Paris and Nicky hopped up on a speaker and shimmied for the crowd.
As if that wasn't reason enough to holler "Woot!", it was also Carmen Electra's birthday, which she celebrated with a pink-frosted marble cake that she shared with fiancé Rob Patterson.
Adrian Grenier was showing off his new squeeze, a short brunette whom he was spotted holding hands with earlier in the night when they attended the show.