Joaquin Phoenix is set to play The Joker in a standalone movie.
Todd Phillips is directing an origins tale about the Joker for Warner Brothers.
Sources tell Variety that Joaquin has agreed in principle to starring in the film.
Variety reported that Phoenix and Phillips met late last year to discuss the project.
Phillips was just waiting for the go-ahead from the studio to formally offer him the role.
The movie, and Joaquin's casting, will have no effect on Jared Leto's version of The Joker.
Phillips will also write the comic book adaptation of the movie.