Justin Bieber joins Mary J. Blige and others for 'Christmas in Washington'

Fifteen-year-old soul-singing phenomenon Justin Bieber has been added to the list of performers who will ring in the holidays with President Obama and the First Lady at Christmas in Washington, a televised musical special that benefits the National Children's Medical Center. Bieber, a self-taught musician, joins heavy-hitters like Mary J. Blige, Neil Diamond, Sugarland, Rob Thomas and Usher, who helped sign the teen to his joint venture label RBMH – Island, for the special, which airs exclusively on TNT Dec. 20 at 8 p.m.