One of the Biebs' besties, crooner Usher, joined the heartthrob on a version of "The Christmas Song (Chestnuts Roasting On An Open Fire)." Judging by the screams from the crowd, they were pleasantly surprised! (11/23/2011)
Justin Bieber's Expensive Christmas Sweater
The pop star dons the pricey piece for a performance on the "Today" show, featuring his pal Usher.