You'll have to forgive Justin Bieber because he seems to be a little behind on what's socially acceptable.

For no reason whatsoever, the singer got a little cheeky over the weekend and flashed his bare bum on Instagram. File this under "Ways to NOT promote your upcoming album."

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Justin has since deleted the photo, but not before it circulated the internet within four seconds. And apparently, his manager Scooter Braun was happy with the publicity. "As a prankster u have to respect another good prank. only makes sense. #crackdealer," he tweeted.

The only problem is that Scooter doesn't seem to know the definition of a prank. Pulling down someone else's pants and taking a photo is a prank. Pulling down your own pants and taking a photo is just bad form.

What do you think of Justin's pants-dropping debacle?

Photos courtesy of Getty Images and web.stagram.com/n/justinbieber