Blunt and Gervais join other names such as Alan Arkin, Billy Crystal, Jack Black, Zach Galifianakis and Jean-Claude Van Damme, who are also providing cameo performances.
Disney’s new Muppets film will see the Muppets reunite to put on a show in order to save their movie studio from a developer.
James Bobin is directing from a script by Jason Segel and Nicholas Stoller. Segal, Amy Adams, Chris Cooper and Rashida Jones will play key human roles within the film.
Expect the film to be released by Christmas 2011.
THR reported this story first.