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 long-running FX comedy series It’s Always Sunny in Philadelphia (2005–present).
Olson starred as Mackenzie “Micky” Murphy in the Fox comedy series The Mick (2017–2018) 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 co-star on It’s Always Sunny in Philadelphia, since 2008.
1989 • TV
1999 • TV
2014 • TV
2014 • TV
2000 • Movie
2024 • Movie
as Bidding Customer
as Ms. Nielsen
as Arizona Cop
as Destiny (voice)
as Tatiana
as Libby
as Alex
as Vicki
as 3D Movie Girl (voice)
as Deandra "Sweet Dee" Reynolds
as Dee Reynolds
as Sherry
as Mayor Spengler
as Destiny (voice)
as Rocky 2
as Self
as Quinn Hopper (voice)
1 episodes
as Brenda Quagmire (voice)
1 episodes
as Self
1 episodes
as Self - Guest
1 episodes
as Helen (voice)
2 episodes
as Self
1 episodes
as Morgan Gillory
28 episodes
as Deandra 'Dee' Reynolds
177 episodes
as Cheryl's Sister
2 episodes
as Becky
5 episodes
as Ashley
2 episodes
as Self
1 episodes
as Self - Guest
2 episodes
as Traylor
13 episodes
as Dee
1 episodes
as DJ
12 episodes
as Field Agent
2 episodes
as Edison Jaymes
1 episodes
as Self
6 episodes
as Ethel Anderson (voice)
10 episodes
Producer
