Kaitlin Willow Olson McElhenney born August 18 1975 is an American actress comedian and producer She began her career in The Sunday Company at the Groundlings an improvisational theatre and school in Los Angeles California She had minor roles in several television series before being cast as Deandra Sweet Dee Reynolds on the longrunning FX comedy series Its Always Sunny in Philadelphia 2005present Olson starred as Mackenzie Micky Murphy in the Fox comedy series The Mick 20172018 and as Cricket Melfi in the Quibi comedy series Flipped 2020 which earned her a nomination for the Primetime Emmy Award for Outstanding Actress in a Short Form Comedy or Drama Series She has also appeared in films including Leap Year 2010 The Heat 2013 Vacation 2015 Finding Dory 2016 and Arizona 2018 She has been married to actor Rob McElhenney her costar on Its Always Sunny in Philadelphia since 2008
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