Justin Bieber is gearing up to bare it all with his Believe: Acoustic album.

No, we don’t mean he’s planning to moon us all again. (Not that we’d complain about that either, though.)

The Biebs is baring his personal life and, we’re guessing, his relationship with now-ex Selena Gomez (awkward) in his brand-new song "Yellow Raincoat." In the track, it’s easy to see -– or hear, at least -– that Justin has come a long way from his side-swept hair and purple hoodies. He’s actually turning into a grown man!