Al Roker and Savannah Guthrie host the 79th annual lighting of the Christmas tree in Manhattan. Adding glow are slated performances by Neil Diamond, Tony Bennett, Justin Bieber, Michael Bublé, Cee Lo Green, Carole King, Katharine McPhee, Big Time Rush and Javier Colon. Included: the Mariah Carey and Justin Bieber video "All I Want for Christmas Is You."