Rihanna, Jay-z and Kanye West were among guests that were spotted at Marquee Nightclub in Vegas on New Years Eve Earlier that night, Jay played a million dollar gig at the Grand Opening of the Cosmopolitan Resort were he had 50 rooms booked for family and friends. His wife Beyonce also hit the stage as a surprise guest.

Other celebrities at the grand opening included Jennifer Lopez & Marc Anthony, Cassie & Diddy, 50 Cent, Floyd Mayweather and more. See all the fabulous pics over at WorldRedEye.com