Matchbox Twenty's Rob Thomas sang his heart out on "A New York Christmas," an original tune he penned after 9/11. You can see all the festive performances when "Christmas in Washington" airs December 20 at 8 p.m. ET/PT on TNT. Kevin Mazur/WireImage.com - December 13, 2009
Christmas in Washington
Mary J. Blige, Justin Bieber, and more get into the holiday spirit while performing for the Obamas in Washington DC.