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Justin Bieber, Twit Pic

Instagram

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."

Justin Bieber, Twit Pic

Instagram

"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!