Pete Doherty has been arrested for drug possession. That's nothing new. But getting busted immediately after leaving a court hearing for DUI? Wow.

The 30-year-old singer was escorted from Gloucester Court to a local police station by officers on suspicion of possession of a controlled substance.

A spokeswoman for Gloucestershire Constabulary confirmed: "A 30-year-old Wiltshire man has been arrested on suspicion of being in possession of a controlled substance. He is currently assisting police with their inquiries."

It was not revealed what substance Pete Doherty was believed to have been in possession of when he was arrested ... but heroin is a good guess!

SMOKED: Pete Doherty just racked up drug bust #22 today.

Earlier in the day, the former boyfriend of Kate Moss pleaded guilty to drunk driving charges and received a £2,050 fine and an 18-month driving ban.

This punishment was handed down despite the singer having already been banned from driving in 2007 and never renewing his license afterward.

The charges related to an arrest in June, when he was caught driving away from a concert after consuming more than half a bottle of rum on stage.

He was also busted in June after shooting up on a plane.

The court heard that the out of control rocker had 21 previous drug offenses and six previous motoring offenses. We would have guessed higher.

Seriously, this guy puts Amy Winehouse to shame ... which is saying something!