The show, set in a U.S. high school, has already attracted notable cameo appearances from Jennifer Lopez and Josh Groban, while Lady Gaga and Madonna have both given permission for their most famous tracks to be used in the routines.
And after working with Pretty Woman star Roberts on her new film, Glee creator Ryan Murphy is hoping she will join the cast of the hit TV programme.
He says, “”I just finished a movie with Julia, Eat, Pray, Love. She saw the rough cuts and fell in love with the show. I don’t know if Julia’s gonna do it, maybe. But she loves the show.”