David Letterman will hang up his glasses and tie in May but before then, he's got to talk to his famous friends one last time. CBS gave us a sneak peek at who's showing up over then next month of Late Show. Among the names making appearances in the coming weeks include Steve Martin, Tina Fey, Don Rickles, Oprah Winfrey, Tom Hanks, Jerry Seinfeld, Robert Downey Jr., George Clooney, Julia Roberts, John Travolta, Jack Hanna, Michael Keaton, Ray Romano, Paul Rudd, Martin Short, Howard Stern, Bruce Willis, Elvis Costello, Dave Matthews Band, Mumford and Sons, Tom Waits, and Bill Murray, who was the first guest on Letterman's Late Night in 1982 and Late Show in 1993. Letterman's final show is Wednesday, May 20.
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