Nbc

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In this publicity image released by NBC, host Jimmy Fallon, left, performs with singer Justin Timberlake during "Late Night with Jimmy Fallon," Wednesday, Sept. 29, 2010 in New York. (AP Photo/NBC, Lloyd Bishop)

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From top left; George W. Bush appears on NBC's "Deal or No Deal," Bill Clinton stops by the "Arsenio Hall Show" and President Barack Obama on "The View." (View photo ABC via Associated Press)

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In this June 1, 2009, file photo provided by NBC, Conan O'Brien makes his debut as the host of NBC's "The Tonight Show" in Universal City, Calif. O'Brien was nominated for an Emmy for outstanding variety, music or comedy series on Thursday, July 8, 2010, for his work on "The Tonight Show with Conan O'Brien." The 62nd Primetime Emmy Awards will be held on Sunday, Aug. 29, in Los Angeles. (AP Photo/NBC, Paul Drinkwater)