Celebrities from far and wide came out for the Grand Opening weekend of The Cosmopolitan of Las Vegas and partied at Marquee Nightclub and Dayclub on Thursday Dec. 30.
Solange Knowles and Samantha Ronson DJ’ed in the club’s library room, while Blake Lively rocked out with Gossip Girl co-star Jessica Szohr and Twilight pal Kellan Lutz.
A special performance by Florence and the Machine kicked off the night after more famous faces like Cameron Diaz, Haylie Duff, Nick Zano, Mel B, Ellen Pompeo, Channing Tatum and Jenna Dewan arrived at the bash.
John Mayer, Christina Millian, and Beyonce were also on hand to join in on the festivities for 2011.
The next night Jay-z and Coldplay sang on stage at the hotel to ring in the New Year.