Flavor Flav's mugshot

*TMZ is reporting that Flavor Flav was locked up in a Las Vegas this weekend after a routine traffic violation turned into an arrest on four outstanding warrants.

Las Vegas police say Flav, real name William Jonathan Drayton, Jr., was pulled over at 10:57 p.m. Friday night.  After running his name in the system, cops learned the rapper was a wanted man stemming from several prior brushes with the law.

According to law enforcement, Flav never settled up with the court in four separate automobile-related matters — including driving without proof of insurance, a parking violation and two cases of driving without a license.

He was taken to a nearby jail — where he was booked, posed for a brand new mug shot and was eventually released.