JAY-Z BRINGS IN THE NEW YEAR

Jay-Z in Cold Play brought in the new year with a star studded concert in Vegas.



The two power houses performed at the grand opening of The Cosmopolitan, a $3.9 billion hotel on the famous Strip.

But those two acts weren't the only ones to take the stage: Beyoncé, Kanye West and John Mayer all made surprise appearances during Jay-Z's performance.

Beyoncé joined her hubby for "Forever Young" and sang "Halo" with Chris Martin. Mayer played guitar with Jay-Z on his hit song "99 Problems."

"All the problems you were going through have been kicked out the door," Jay-Z told the crowd before a collaborative performance of West's "Homecoming," which featured Jay-Z, West and Martin.

Gwyneth Paltrow was also on hand to watch the show – and ring in the 2011 with her husband and close friends.

The intimate crowd was littered with celebrities - Cameron Diaz and Alex Rodriguez; Jennifer Lopez and Marc Anthony.

GV Says: I so love how Hov has evolved and opened the boundaries of hip-hop. Way to keep the checks coming Jigga...