By Alexis Tereszcuk – Radar Senior Reporter 
 
 Lindsay Lohan‘s on-again-off-again girlfriend Samantha Ronson was arrested on suspicion of DUI Monday morning, RadarOnline.com has confirmed. 
 
 The 33-year-old DJ was pulled over near Baker, Calif. at 10:30 am for speeding and after she refused to submit to a breathalyzer test on the scene, she was arrested and taken to the Barstow jail. 
 
 Once at the jail, however, she changed her mind and did take a breathalyzer, authorities tell us. 
 
 She was released from the jail several hours later. 
 
 The District Attorney’s office tells us it will be a day or two until it decides whether to file charges against her. 
 
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 Ronson was traveling back from Las Vegas where she spun at the Lavo nightclub in the Palazzo Sunday night. 
 
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 Sam Ronson Arrested for DUI 
 
 was arrested this morning for DUI outside Baker, California -- home of the world's biggest thermometer --TMZ has learned.According to the booking sheet, 33-year-old Ronson is listed as 5'7" and 102 pounds.Law enforcement sources tell TMZ, Lindsay Lohan 's ex-girlfriend was driving home from Las Vegas at 10:30AM in her black Porsche when she was pulled over for speeding.We're told she was given a field sobriety test and didn't perform well. According to our sources, she refused to take what is commonly called a "roadside blow" -- a less-scientific breathalyzer, which is not a mandatory test. She was arrested at the scene.Ronson was transported to the Baker substation, where we're told she blew over the legal limit. According to sources, she was cooperative the entire time.Sam DJ'd last night at the Lavo nightclub in the Palazzo hotel in Vegas.Thanks to our friends at SpyOnVegas.com for the pic.
– Bad: Getting arrested on suspicion of DUI. Worse: Getting arrested on suspicion of DUI at 10:30 in the morning. That's what happened yesterday to Samantha Ronson, DJ and Lindsay Lohan ex extraordinaire. Ronson was pulled over on her way home from Las Vegas, where she DJed Sunday night, when cops spotted her speeding in her black Porsche at 10:30am. Sources tell TMZ she didn't do well on her field sobriety test, then refused to take a breathalyzer and was arrested. At the station, she allegedly was found to be over the legal limit. Radar notes that she was released from jail last night.