Article Photos: Letterman, Hoffman, Zeppelin honored by Obama

2012 Kennedy Center Honoree comedian David Letterman shakes hands with his wife Regina as they arrive at the State Department for the Kennedy Center Honors Gala Dinner on Saturday, Dec. 1, 2012 in Washington. (AP Photo/Kevin Wolf)

2012 Kennedy Center Honoree comedian David Letterman shakes hands with his wife Regina as they arrive at the State Department for the Kennedy Center Honors Gala Dinner on Saturday, Dec. 1, 2012 in Washington. (AP Photo/Kevin Wolf)