Jay-Z, 50 Cent & Diddy Ring In New Years (Video)

Kanye West did his best to steal the show from Jay-Z, who rocked Las Vegas at a celeb-packed New Year's Eve party. West turned up at the lavish opening of the $3.9 billion Cosmopolitan Hotel at the last minute -- then crashed the show by Jay-Z, who along with Coldplay was paid up to $2.5 million to perform as a headline act. Other stars were happy to support the headline acts. John Mayer played guitar, and Chris Martin later returned to play piano for Beyoncé. The party moved on to Club Marquee where Beyoncé, Jay-Z, 50 Cent, West, Floyd Mayweather, Rihanna, Sean Combs, Gwyneth Paltrow and Chris Martin, Alex Rodriguez and Cameron Diaz held court. (New York Post)