Lindsay Lohan's Deejay Ex Samantha Ronson Busted for DUI

Lindsay Lohan arriving at Samantha Ronson's home in Hollywood Hills on March 26, 2009. (X17online.com)

Sam Ronson was arrested Tuesday morning outside Baker, California for DUI, TMZ reports.

According to the booking sheet, 33-year-old Ronson is listed as 5'7" and 102 pounds.

Now that's skinny.

Law enforcement sources tell TMZ that Ronson was driving home from Las Vegas at 10:30AM in her black Porsche when she was pulled over for speeding.

She was given a field sobriety test and didn't perform well, TMZ reports. She refused to submit to a breathalyzer and was arrested on the scene.

Ronson was transported to the Baker substation, where we're told she blew over the legal limit.

Sam performed at Lavo nightclub Monday night.

Ronson and Lindsay Lohan were an on-again off-again couple for much of Lohan's descent into alcohol and drug problems, during which Ronson was often portrayed as the calmer head.