James Franco's "The Disaster Artist" is getting more and more star-studded. Sharon Stone is added to the list, joining Seth Rogen, Dave Franco, Josh Hutcherson, Zac Efron, Kate Upton, Alison Brie, Ari Graynor, Jacki Weaver, Hannibal Buress and Andrew Santino.

Franco is starring in addition to directing the film. He is portraying Tommy Wiseau, the helmer of 2003 drama "The Room" which is deemed the worst movie of all time. "The Disaster Artist" will be a making-of story based on a nonfiction book of the same name written by "The Room" star Greg Sestero.

Dave is attached to star as Sestero who wrote in the book his experience as a struggling actor, filming with the eccentric Wiseau and their unlikely friendship. Despite generating criticism, "The Room" developed a strong cult following that includes celebrities. The movie, about a man being cheated on by his fiance, was said "so bad it's good".

Filming has started last week. Stone's role, which was first revealed by THR, is not yet disclosed.