Mary Elizabeth Ellis (born May 11, 1979 in Laurel, Mississippi, height 5' 4" (1,63 m)) is an American actress and writer best known for her recurring role as "The Waitress" on the FX comedy series It's Always Sunny in Philadelphia. She also starred in the NBC sitcom Perfect Couples. Description above from the Wikipedia article Mary Elizabeth Ellis, licensed under CC-BY-SA, full list of contributors on Wikipedia.