Previously announced cast members include Keira Knightley, Mark Ruffalo, Hailee Steinfeld, Adam Levine and Catherine Keener.
Pic will start production next week in New York City. Green portrays Troublegum, a very successful hip-hop star.
Likely Story’s Anthony Bregman will produce the film with Judd Apatow as exec producer.
Carney is working with Gregg Alexander (New Radicals) on the music for the film.
Exclusive Media’s Tobin Armbrust will oversee production on the film. Sales are being handled by Exclusive’s Alex Walton.
Green came to prominence as a member of the hip-hop group Goodie Mob, later formed Gnarls Barkley and recently wrapped the second season of TV series “The Voice,” where he’s a judge.
Green is represented by Larry Mestel at Primary Wave Talent Management who negotiated the deal on his behalf.