Z100's Jingle Ball Concert 2011

Without skipping a beat, Z100's annual Jingle Ball kicked off at exactly 7:30 p.m, Friday night in New York. It is an annual concert produced on by KIIS-FM radio station. The concert series is noted for featuring several marquee performers in a day long series of sets. Often, noted celebrities are on hand to introduce each act.

This year's head-turning lineup featured Demi Lovato, Kelly Clarkson, LMFAO, Pitbull, Foster the People, Mindless Behavior, the Script, David Guetta, Gym Class Heroes and Lady Gaga, who brought some of the year's biggest hits to the Madison Square Garden stage.

Gaga's career came full circle for a moment when she headlined Z100's annual Jingle Ball concert, an event that holds special meaning to the New York native.

Her first concert as a young girl growing up in New York City was the Z100 Jingle Ball, "I worked so hard and when I was 11... my mom got me tickets to Jingle Bell Ball", said Gaga.

Gaga opened the Jingle Ball concert three years ago, she said, "I'll never forget there were a whole lot of superstars and no one knew who the hell I was... Some people thought I was going to be a one-hit wonder."

She was recently nominated for three Grammys, proved to be otherwise, and sang a few of her best-known songs, including "Telephone," "Just Dance" and "Edge of Glory".