Bieber has co-signed Meghan Trainor's smash "All About That Bass" and added his own touch to the Maejor Ali remix, out yesterday (Oct. 15). The remix is more like a duet, with Bieber opening up the song, singing along to Trainor's vocals. "I'm all about that bass, no treble / We gonna take it to a whole 'nother level," he declares over towering bass - Ali's remix really took the title and ran with it.

With that, the track evolves into a whole new sound, swerving between a menacing trap beat and the sugary pop chorus Trainor laid down. "We know that s**t ain't real / We know it's Photoshopped!," Bieber says, without adding any explanation.