Samantha Ronson was arrested on two misdemeanor DUI counts, Us Weekly reports.
She was pulled over at 10:30 a.m. Monday in Baker, Calif., for speeding and was given balance tests after showing signs of being impaired, an officer told the magazine.
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Ronson, who dated Lindsay Lohan on and off for two years, admitted that she had drank late the previous night and was on her way home from Las Vegas. "She was friendly and talkative," the officer said. "She was cooperative throughout the whole ordeal."
The 33-year-old DJ was released Monday afternoon.