Wilmer Valderrama in Cop Dramarrama

6/28/2011 2:40 PM PDT

Wilmer Valderrama in Cop Dramarrama

Hours before he hit the red carpet for the premiere of his new movie, Wilmer Valderrama had to put his autograph on a speeding ticket after he was popped in L.A.

Law enforcement sources tell us Wilmer was cooperative during the stop ... even smiling while he got his ticket. We're told the ticket will run Wilmer upwards of $300.

A short time later, Wilmer threw on his suit and rolled on over to the premiere of "Larry Crowne" ... acting like nothing ever happened.

Best performance yet?!