Diane Haithman is contributing to Deadline’s TCA coverage.

Megan Mullally, who is joining the cast of the Fox comedy Breaking In, confirmed today that the long-rumored Party Down movie, inspired by the Starz series, is now a go and she will be part of it. “John Enbom is writing it right now, I’m excited about that,” Mullally said during a Fox panel at the TCA in Pasadena. After the session, she added that the entire cast is expected back with the possible exception of Jane Lynch, whom Mullally actually replaced (as a different character) after the first season. Filming on the pic is eyed for late spring/summer. Starz canceled the series back in June. It followed six actors and writers as they do side gigs and try for their first big break. The cast of the show, created and primarily written by Enbom, Rob Thomas, Dan Etheridge and Paul Rudd, included Adam Scott, Ken Marino, Mullally, Ryan Hansen, Martin Starr and Lizzy Caplan.