Kaitlin Willow Olson (born August 18, 1975) is an American actress and comedian. 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.
who plays d on it's always sunny
Kaitlin Willow Olson