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Samantha Ronson's mug shot is out, and by the looks of it, the famous DJ wasn't too thrilled to be thrown into the slammer. Sam was arrested Monday morning for driving under the influence

Ronson, 33, was pulled over by the California Highway Patrol at 10:30am for speeding in her black Porsche and failed a sobriety test. She refused to take a breathalyzer and was transferred to the Barstow station where she blew over the legal limit.

As a result of her DUI arrest, she called in sick to a scheduled gig last night at The Brig in Venice ... telling her bosses she "had a rough day and won't be able to make it."

Rough, indeed.