Hear Justin Bieber's new single 'Boyfriend'

Justin Bieber's new single “Boyfriend” has arrived. Released last night, it's already topping the iTunes chart as well as blowing up Twitter.

Produced by Mike Posner, “Boyfriend” shows off The Bieb's new mature style, with a smooth R&B-influenced song that's part Justin Timberlake, part “Teach Me How to Dougie.”

Photo: Justin Bieber arrives for the NRJ Music Awards 2012 earlier this year in Cannes, France. (Jan. 28, 2012)