Kaitlin Olson is an American actress, comedian, and producer, best known for her role as Dee Reynolds on the television show It's Always Sunny in Philadelphia. Born on August 18, 1975, in Temecula, California, she has built a successful career in comedy and television. In addition to her work on It's Always Sunny in Philadelphia, Olson starred in the sitcom The Mick and has made guest appearances on various shows, including Parks and Recreation. She is also known for her voice work in animated series like Family Guy and Bob's Burgers.