David Letterman Signs Off: Photos

Drew Barrymore turns to the audience after flashing David Letterman during the April 12, 1995 show. Alan Singer/CBS via Getty Images
David Letterman in NBC's Studio 6A, Jan. 19, 1982, during the announcement of a new NBC comedy show, "Late Night With David Letterman". AP Photo/Perez
David Letterman during taping of the first "Late Night with David Letterman" with guest Bill Murray, Feb. 1, 1982 in New York. AP Photo/Nancy Kaye
Joaquin Phoenix during his infamous appearance on the Late Show with David Letterman, Feb. 11, 2009. John Paul Filo/CBS via Getty Images
Bill Murray attempts a field goal on New York's 53rd Street with David Letterman, Jan. 31, 2012. John P. Filo/CBS
Eddie Murphy as Gumby with Joe Piscopo as David Letterman during a 'Late Night with David Letterman' skit on May 13, 1983. Al Levine/NBC/NBCU Photo Bank
David Letterman with Johnny Carson during a taping of the "Tonight Show", Aug. 30, 1991. This was Letterman's first appearance since Carson announced his retirement and Jay Leno was named his replacement. AP Photo/Bob Galbraith
Jay Leno and David Letterman on April 13, 1987. Alan Singer/NBC/NBCU Photo Bank via Getty Images
David Letterman, circa 1970. Michael Ochs Archives/Getty Images
Bill Murray, Lady Gaga and David Letterman during a taping on April 2, 2014. Greg Allen/Invision/AP
David Letterman and Harrison Ford ride horses outside the Ed Sullivan Theater, July 18, 2011. James Devaney/WireImage
David Letterman hitting a return to Andy Roddick, Aug. 27, 2009. Gustavo Caballero/Getty Images
Stupid pet tricks on the Late Show with David Letterman, Feb. 24, 2011. Heather Wines/CBS via Getty Images
Farmer Bob Corbett of North Lewisburg, Ohio, shepherds his prize-winning boar, Hog Chief, past David Letterman, April 24, 1987. AP Photo/G. Paul Burnett
David Letterman plays baseball in Central Park, circa 2002. Richard Corkery/NY Daily News Archive via Getty Images
David Letterman throwing a pitch to New York Mets third baseman David Wright, April 14, 2008. AP Photo/Jeff Zelevansky
David Letterman wearing a specially designed suit of sponges, Feb. 14, 1985. Letterman weighed 190 lbs. before and a whopping 500 lbs. after soaking up about 25 gallons of water. AP Photo/Richard Drew
David Letterman dresses up in a marshmallow costume, Sept. 2, 1988. R. M. Lewis jr./NBC/NBCU Photo Bank via Getty Images
David Letterman competes in a kayak race during the 'Battle of The Network Stars' in Malibu, 1978. Bob Grant/Fotos International/Getty Images
David Letterman, circa 1980. Maureen Donaldson/Getty Images
Liberace, David Letterman and Bob Dylan, March 22, 1984. Al Levine/NBC/NBCU Photo Bank via Getty Images
With CBS president and CEO Laurence Tisch at his side, David Letterman tells of his move from NBC to CBS, Jan. 14, 1993. CBS announced that Letterman's show will run against NBC's "The Tonight Show" with Jay Leno. AP Photo/Alex Brandon
Bill Murray spray paints Dave's desk on the first taping of the Late Show with David Letterman on CBS, August 30, 1993. Alan Singer/CBS via Getty Images
David Letterman, Garry Shandling, Jay Leno and "Tonight Show" host Johnny Carson on the "26th Anniversary Show", Oct. 6, 1988. Joey Del Valle/NBCU Photo Bank
Robin Williams with Dave, Sept. 25, 2013. John Paul Filo/CBS via Getty Images)
Justin Bieber with David Letterman Nov. 23, 2011. John P. Filo/CBS
Kathy Griffin strips for Dave as she did for Anderson Cooper on New Year's Eve, when she visits the Late Show with David Letterman, Jan. 19, 2012. John P. Filo/CBS
John McEnroe is front and center as Carmelo Anthony, Henrik Lundqvist, Bill Bradley, Gerry Cooney, John Starks, Larry Johnson, Rod Gilbert, and Walt Frazier do the Top Ten List as Madison Square Garden Legends on the Oct. 14, 2013 show. John Paul Filo/CBS via Getty Images
Madonna, riding on the hockey sticks of ten New York Rangers, makes her entrance. The Rangers were on hand to deliver the Top Ten list. John Paul Filo/CBS via Getty Images
Richard Pryor with Dave, Jan. 15, 1987. AP Photo/Susan Ragan
David Letterman with his Emmy, Sept. 22, 1985. AP Photo/Nick Ut
David Letterman and Jon Stewart appear on stage at Comedy Central's 'Night Of Too Many Stars: An Overbooked Concert For Autism Education' Oct. 2, 2010. AP Photo/Charles Sykes
David Letterman added the sixth "Emmy" to the Late Show collection Sept. 23, 2002 John Paul Filo/CBS via Getty Images
David Letterman welcomes townspeople from the "metropolitan" and "suburban" areas of Bolan, Iowa on Mar.1, 1989. Bolan's entire population of 16 took Letterman up on his offer to treat them to a visit to the big city. AP Photo/Susan Ragan
Helen Mirren chats with Dave about the Oscars and her new Broadway play "The Audience", Feb 23, 2015. Jeffrey R. Staab/CBS via Getty Images
Dennis Rodman gives Dave a new look, Aug. 20, 1996. Alan Singer/CBS via Getty Images
Vice President Al Gore cracks an ashtray with a hammer, Sept. 8, 1993. Alan Singer/CBS via Getty Images
David Letterman visits US Marines in Taqaddum, Iraq, Dec. 24, 2004. Cpl Jessica Richards/AFP/Getty Images
David Letterman gets dressed at home in Westchester County, New York, March 1984. Susan Wood/Getty Images
David Letterman passes under the marquee of the Ed Sullivan Theater in New York on Aug. 30, 1993. AP Photo/Joe Tabacaa