DJ Samantha Ronson was spinning her wheels after spinning some records at a Vegas party after she was arrested for driving under the influence Monday morning. Ronson, who's most famous for being Lindsay's lady friend back in the day, was popped in Baker, Calif., Monday morning at 10:30 for doing 89 mph in a 70-mph zone. "Speed was why she was stopped, but she was arrested on [two] misdemeanors of driving under the influence," an officer told Us Magazine. "When she was stopped, she showed signs of being impaired. [The officer] gave her balance tests and she showed signs of alcohol intoxication." But sources say she was friendly and cooperative while being administered a breathalyzer and being booked. Us reports the 33-year-old admitted to drinking the night before and waking up to drive home to L.A. from Las Vegas. Looks like she needed to sleep it off a bit longer.