Lil Twist’s DUI Arrest — WEEEEEEEED, Son!!!

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Lil Twist was driving Justin Bieber“s car while under the influence of marijuana … and he even had a LIT BLUNT in the car at the time of his DUI arrest, law enforcement sources tell our sources.

We broke the story … 20-year-old Twist was busted in Calabasas around 3:30 AM Thursday morning on his way to Bieber”s house.

Twist was hauled to a nearby station, where he was booked … and was later released after roughly 8 hours in custody.

As he left the Sheriff”s station, Twist didn”t have much to say to us. We”re guessing he”ll be more talkative when he explains himself to JB.