Lynne Marie Stewart, the actor best known for her iconic role as Miss Yvonne in Pee-wee`s Playhouse and appearances in It`s Always Sunny in Philadelphia, has passed away at the age of 78, as reported by Variety.

Stewart became a beloved figure through her portrayal of Miss Yvonne in the Pee-wee franchise, which included appearances in The Pee-wee Herman Show (1981), Pee-wee`s Big Adventure (1985), Pee-wee`s Playhouse (1986-`90) Big Top Pee-wee (1988), Christmas at Pee-wee`s Playhouse (1988) and Pee-wee`s Big Holiday (2016).