Sam Ronson's Mug Shot -- Attitude Much?

Sam Ronson dropped one hell of a sass-bomb when she posed for her mug shot yesterday -- moments after she was arrested for DUI.

As we previously reported, Ronson was driving back to L.A. from Vegas after a DJ gig -- when she was pulled over for speeding, and botched a field sobriety test. She was arrested on the scene on suspicion of DUI.

Ronson was released yesterday afternoon.