Justin Bieber Duets with Usher & Jordin Sparks at Z100 Jingle Ball

Usher was all smiles as he introduced his 15-year-old protégé Justin Bieber at Z100’s Jingle Ball 2009 on Friday (Dec. 11). The two dueted on Usher’s hit “U Got It Bad,” and Bieber also performed “No Air” with Jordin Sparks. Jay Sean, Pitbull, Taylor Swift, Adam Lambert, and more rocked the (jingle) bells at the sold-out concert at Madison Square Garden in New York City.