Justin Bieber oughta think twice before loaning his car out ... because it was involved in yet another run-in with cops.  


Bieber wasn't driving. The guy behind the wheel -- Lil Za -- was pulled over in West Hollywood -- apparently for tinted windows -- today at around 1:30 AM.  The driver didn't have a license, so deputies put him in the back of the squad car and it looked like he was under arrest.  Driving without having a license is an arrestable offense. 

But deputies cut the dude a break, and he was cited and released.


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