billboard.com–
First it was Ludacris on "Baby." Then Kanye West remixed his "My World 2.0" track "Runaway Love" with Raekwon. Then, just when we thought he wasn't going to ask Busta Rhymes to be on his version of "Little Drummer Boy," he did just that. Now, pop superstar and "Otis" freestyler Justin Bieber...
Topics:Hip-hop, Pop
