Glam Alert! Stars Rock Out for Z100's Jingle Ball

The holidays have a way of boosting everyone's spirits, and the biggest stars from TV, music, and movies came out on Dec. 9, 2011 to get festive for Z100's annual Jingle Ball presented by Aeropostale in New York City. The concert featured performances from superstars like Lady Gaga, Kelly Clarkson, and LMFAO — plus, TV's brightest were in attendance, with names like Khloe Kardashian, Christian Siriano, and Kelly Bensimon hitting the red carpet. Check out pics from the star-studded show!