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His mommy needs to put him on a time out!

Justin Bieber and a couple of pals went on a ski vacation to Colorado earlier this week, and shredding the mountain must have been exhausting, because good friend Lil Za fell asleep on the couch and The Biebs took the opportunity to pull down his pants and moon him!

"@LilXZa u ass leep???" he captioned the snapshot he posted to Instagram.

Dudes don't usually like other dude's butt cheeks in their face, so this probably didn't go over too well!

After spending some time in The Rockies, the pop star made his way down to Miami, where he hit Mansion nightclub... then a strip club!

The "Baby" singer reportedly splashed over $75K on dancers, too!

The Canadian sensation also shared a pic of himself smoking a cigar, so it remains to be seen if his whirlwind vacay carried on to Cuba.

Somewhere, Selena Gomez is breathing a sigh of relief that she's done with this mess!