'Pee-wee's Playhouse' Star Lynne Marie Stewart Dead at 78

Published February 22, 2025 9:04 AM PST

Lynne Marie Stewart, the actress best known for her roles in "American Graffiti,"  "Pee-wee’s Playhouse" and "It’s Always Sunny in Philadelphia," has died, according to a former Hollywood colleague.

Cassandra Peterson, known for her iconic “Elvira” character, shared the sad news on IG, writing ... "My heart is breaking upon hearing the news of my dear friend Lynne Stewart’s passing. One of the kindest, sweetest, funniest women who ever lived. The iconic Miss Yvonne of Pee-wee’s Playhouse: She’ll always be 'the most beautiful woman in Puppetland'. 💔"

Stewart was in CP's "Elvira: Mistress of the Dark" ... Cassandra and the late 'Pee-wee' actor Paul Reubens were super close, so stands to reason she'd know.

We reached out to a rep for Stewart for more info ... so far, no word back.

As Cassandra noted, Stewart played Miss Yvonne, The Most Beautiful Woman in Puppetland, on "Pee-wee’s Playhouse" from 1986 to 1990 ... and she appeared in several other 'Pee-wee' titles, including "Pee-wee's Big Adventure" and "Big Top Pee-wee."

The actress also appeared in the iconic George Lucas film "American Graffiti" and the Arnold Schwarzenegger classic, "The Running Man."

Stewart’s more recent fan-favorite role was as Charlie Kelly’s mother Bonnie, in "It’s Always Sunny in Philadelphia."

She was 78.

RIP