Justin Bieber and Lil Twist Get Dirty on Four-Wheelers

Selena Gomez's ex and rapper were "Ridin dirtyyyyyyyy" on ATVs Wednesday

Justin Bieber might be a pretty boy, but he's not afraid of getting down and dirty!

Selena Gomez's ex and rapper Lil Twist were "Ridin dirtyyyyyyyyy" on ATVs Wednesday.

The Biebs Instagrammed a few shots of "Me and Twizzy getting a little muddy."

"fun day," Justin tweeted that afternoon.

Well, that much is clear from the pics. We just hope these four-wheeling friends are wearing helmets when they're in action!