Justin Bieber + Friends: Adam Levine

Justin Bieber is one of the biggest pop stars on the planet, so it only makes sense that he's pals with one of the world's biggest rock stars. Maroon 5 frontman and 'The Voice' coach Adam Levine joined Bieber in the studio for 'Believe.'

While it's unclear just what kinds of hits the duo worked on, it's obvious they had fun together. Bieber posted a prank video on Twitter saying that 'Believe' was on hold while he joined super group with Levine called the Whirling Dervishes.

While we can't wait for 'Believe,' we also wouldn't mind hearing what the pair came up with for their imaginary band!