PHOTOS: Shakira, Adam Lambert, Leighton Meester & More Rock Y100 Jingle Ball

Shakira bent over backwards — literally — to please her fans on Saturday night. The sexy songstress was just one of several big names to take the stage at the Bank Atlantic Center in Sunrise, Fl., for the Y100 Jingle Ball concert. Gossip Girl star Leighton Meester, American Idol alums Adam Lambert and Jordin Sparks, young stars Colbie Caillat and JoJo were also on hand for the festivities.