Kaitlin Olson, American actress, started her career in the television show called Groundlings.
She began her career in the Groundlings , an improvisational group in Los Angeles , California , and had minor roles in several television series before being cast as Deandra `` Sweet Dee '' Reynolds on the FX black comedy series It 's Always Sunny in Philadelphia in 2005 .
Kaitlin Olson
started her career
in the television show called Groundlings
in the Groundlings , an improvisational group in Los Angeles , California