Actress Julianne Moore has joined the cast of the Untitled Joseph Gordon-Levitt Project (once known as Don Jon's Addiction), which will serve as actor Joseph Gordon-Levitt's feature directorial debut.
We first reported on this project last month, when Scarlett Johansson signed on. Joseph Gordon-Levitt will also star as a Don Juan-type character, who goes on a journey to become a less selfish person. Julianne Moore will play a mentor to this lothario. It still isn't known what role Scarlett Johansson is playing.