Kaitlin Willow Olson McElhenney is an American actress and comedian. She is best known for her roles as Deandra "Sweet Dee" Reynolds in the FX comedy series It's Always Sunny in Philadelphia, Mackenzie "Mickey" Molng in the Fox comedy series The Mick, Deborah "DJ" Vance Jr. in the HBO Max comedy-drama series Hacks, and Morgan Gillory in the ABC crime drama series High Potential.
