Jane Lynch and John Leguizamo are joining a lineup that includes Jimmy Kimmel and Kristin Chenoweth to honor Ellen DeGeneres with the nation's top humor prize in Washington tonight. The Kennedy Center is awarding DeGeneres the Mark Twain Prize for American Humor, which honors Mark Twain's tradition of satire and social commentary. The show will be broadcast Oct. 30 on PBS stations. Star entertainers, also including Jason Mraz, John Krasinski, and Sean Hayes, will deliver tribute performances to salute DeGeneres. Click to see who else has won the prize.