Tina Fey waves to fans as she arrives at the Kennedy Center where she was awarded the Mark Twain Prize for humor in Washington, Tuesday, Nov. 9, 2010.
Actress and author Roseanne Barr poses for a portrait Tuesday, Jan. 4, 2011 in New York.
Amy Poehler stars in Parks & Recreation.
Phyllis Diller, c. 1967.
Joan Rivers on Just for Laughs.
Sarah Silverman leaves a taping of the David Letterman show Oct. 13, 2008, in New York.