The Cosmopolitan's Star-Studded NYE 2011 Party

Posted Saturday January 1, 2011 11:22 AM GMT

Making for quite the star-studded affair, a slew of celebs turned up at The Cosmopolitan Grand Opening and New Year's Eve Celebration in Miami, FL on Friday night (December 31).

Among the revelers ringing in 2011 at the swanky soiree were MTV reality star Whitney Port, "Twilight" hunk Kellan Lutz and "Why Georgia?" singer John Mayer - who was a special guest performer.

All well-dressed, newly single Emmy Rossum looked darling as she mingled with fellow guests also including Lance Bass, Christina Milian, Kirsten Dunst and "Sex and the City" star Kristin Davis.

Making for a truly memorable experience, the many celebs were treated to a performance by Jay-Z and Coldplay at the relaunched hotel's Marquee Nightclub to top off the fantastic New Year's bash.