Bieber Shows His True Butt

 Justin Bieber's been caught with his pants down.

The newly single 18-year-old posted a revealing photo of him mooning on his Instagram on Saturday, then quickly deleted it. 

No different from the antics of most boys his age, of course, but before the Biebs could think twice about his revealing snap... the image had been liked 86,000 times. 

By AMELIA PROUD