Rob Riggle and Anne Heche have joined the musical One Shot, joining a cast that already includes Taye Diggs, Topher Grace, and former member of ‘N Sync JC Chasez. Grace is also producing the film, which is being directed by music video director Isaac Rentz. The story concerns a failed Broadway star-turned-stage manager (Grace) who must herd his cast and crew together on opening night of their latest production. The project sounds like it could be a good combination of Noises Off and Waiting For Guffman, or a terrible combination of Birdman and Cradle Will Rock. No word on who any of the other cast members are playing, but all that matters is that JC is getting work!