Joy to Beliebers and their grandparents: The original pop star, Tony Bennett, will be showing Justin Bieber how it's done when they both perform at NBC's annual live Christmas tree-lighting ceremony, 'Christmas in Rockefeller Center' later this month.

The roster of big name performers announced by the network spans not only generations, but also genres, with singers Michael Bublé, Cee Lo Green, Faith Hill, Carole King, Katharine McPhee and 'The Voice' winner Javier Colon performing a mix of current hits and holiday classics.

NBC announced that the hour-long special on November 30 will be hosted by the 'Today Show's Al Roker and Savannah Guthrie and will -- natch -- also feature seasonal high-kickers, The Radio City Rockettes. Prior to the primetime telecast, WNBC and other NBC affiliates (check your local listings) will also air an additional live hour of the special.

If you're wondering who actually flicked the switch for the always impressive Rockefeller Center Christmas tree, you might be surprised or violently angry depending on your personal opinions.

MSNBC's professional right-wing pundit impressionist Keith Olbermann lit the tree during last night's episode of Countdown while dishing on Tiger Woods' series of trysts with gossip monger Michael Musto like a couple of housewives in a beauty parlor with baritone voice. Olbermann officially ushered in Christmas with a switch that looks like he raided the trash bin after NBC dismantled the Family Feud set. Then without missing a beat, the two jump right back into the Tiger trashing.

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