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Kaitlin Olson (born August 18, 1975) is an American actress best known for playing Deandra "Sweet Dee" Reynolds on It's Always Sunny in Philadelphia. She's also the voice of Ethel in the Comedy Central cartoon Brickleberry.

Olson has a voice credit for "Foreign Affairs" and is the voice of Brenda Quagmire in "Screams of Silence: The Story of Brenda Q.".