Justin Bieber Becomes 'Shawty Mane' on Chris Brown Mixtape: Listen

Chris Brown enlisted Justin Bieber to promote his upcoming clothing line, "Kind of Famous," in this twitpic posted June 27.

After giving fans a taste of his MC skills on the popular "Look at Me Now" collaboration, feat. Busta Rhymes and Lil Wayne, Chris Brown released rap mixtape, 'Boy In Detention,' today (Aug. 5). The set features a handful of producers and guest artists from Swizz Beatz to his BFF, Justin Bieber

The mixtape features 21 tracks, including Breezy's remix of Drake's "Marvin's Room" that was released on June 28.

Chris Brown Remixes 'Marvin's Room,' Drake Drops Official Video: Watch

Production duties were handled in part by David Banner, J.U.S.T.I.C.E. League, 9th Wonder, No I.D. and Ryan Tedder. Guest appearances include Wiz Khalifa, Swizz Beatz, Tyga and Big K.R.I.T. Justin Bieber also shows up on "Ladies Love Me" to spit a few verses as his alter ego, Shawty Mane.

Justin Bieber Hits the Studio with Chris Brown

Chris Brown presented "Boy in Detention" as a gift to fans, tweeting, "Almost that time! Just so my fans know I don't make a dime from this. I love y'all. #freemusic."