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.
High Potential
Morgan Gillory · (13 episodes)
2024
Incoming
Ms. Nielsen
2024
Agent Elvis
CeCe Ryder (voice) · (10 episodes)
2023
Champions
Alex
2023
It's a Wonderful Binge
Mayor Spengler
2022
Welcome to Wrexham
Self · (6 episodes)
2022
Abbott Elementary
Dee · (1 episode)
2021
Hacks
DJ · (12 episodes)
2021
Space Force
Edison Jaymes · (1 episode)
2020
Who Wants to Be a Millionaire
Self - Contestant · (1 episode)
2020
Flipped
Cricket Melfi · (11 episodes)
2020
Arizona
Vicki
2018
The F Word
Self · (1 episode)
2017
The Mick
Mackenzie 'Micky' Murphy · (37 episodes)
2017
Marine Life Interviews
Destiny (voice)
2016
Finding Dory
Destiny (voice)
2016
Vacation
Arizona Cop
2015
Late Night with Seth Meyers
Self · (1 episode)
2014
The Heat
Tatiana
2013
Escape from Planet Earth
3D Movie Girl (voice)
2013
Brickleberry
Ethel Anderson (voice) · (10 episodes)
2012
Unsupervised
Carol / Danielle (voice) · (4 episodes)
2012
Unsupervised
Danielle (voice) · (1 episode)
2012
Unsupervised
Carol (voice) · (1 episode)
2012
Unsupervised
(voice) · (2 episodes)
2012
A Tribute to Ryan Dunn
Self
2011
New Girl
Ashley · (2 episodes)
2011
Bob's Burgers
Helen (voice) · (2 episodes)
2011
Conan
Self · (1 episode)
2010
Held Up
Rocky 2
2010
Leap Year
Libby
2010
A Very Sunny Christmas
Deandra "Sweet Dee" Reynolds
2009
The Nightman Cometh: Live
Dee Reynolds
2009
Weather Girl
Sherry
2009
The Riches
(5 episodes)
2007
Out of Practice
(1 episode)
2005
It's Always Sunny in Philadelphia
Deandra 'Dee' Reynolds · (177 episodes)
2005
Kelsey Grammer Presents The Sketch Show
(6 episodes)
2005
Miss Match
Jillian · (1 episode)
2003
Punk'd
Field Agent · (2 episodes)
2003
Jimmy Kimmel Live!
Self · (1 episode)
2003
Meet the Marks
(7 episodes)
2002
George Lopez
(1 episode)
2002
Curb Your Enthusiasm
Cheryl's Sister · (2 episodes)
2000
Curb Your Enthusiasm
Becky · (5 episodes)
2000
Coyote Ugly
Bidding Customer
2000
Eyes to Heaven
2000
Family Guy
Brenda Quagmire (voice) · (1 episode)
1999
The View
Self · (1 episode)
1997
The Drew Carey Show
Traylor · (14 episodes)
1995
The Simpsons
Quinn Hopper (voice) · (1 episode)
1989