Lindsay Lohan might be teetering her way back toward sobriety -- but her ex-girlfriend, Samantha Ronson, is apparently off the wagon.
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TMZ.com reports that Ronson was arrested for DUI on Monday, following a deejaying gig at Lavo nightclub in Las Vegas.
Ronson, 33, was pulled over for speeding in her black Porsche outside of Baker, Calif. at approximately 10:30 a.m.; after performing poorly on a field-sobriety test and refusing a Breathalyzer test, Ronson was hauled into the Baker Sheriff's Department substation, where a test determined that her blood-alcohol level was over the legal limit.
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Ronson, who was reportedly cooperative during the arrest, was released later in the day. Related Articles: It's Time for Hollywood to Help Lindsay Lohan 5 Ways Lindsay Lohan Can Save Herself