The Cosmopolitan’s Star-Studded NYE 2011 Party

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.