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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.

Cliff Owen/AP

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Actress and author Roseanne Barr poses for a portrait Tuesday, Jan. 4, 2011 in New York.

Jeff Christensen/AP

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Amy Poehler stars in Parks & Recreation.

Mitchell Haaseth/NBC

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Phyllis Diller, c. 1967.

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Joan Rivers on Just for Laughs.

CBC

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Sarah Silverman leaves a taping of the David Letterman show Oct. 13, 2008, in New York.

BRIAN MCDERMOTT/AP

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