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 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. She refused to submit to a breathalyzer and was arrested on the scene.
She was transported to the Baker substation, where we're told she blew over limit. According to sources, she was cooperative the entire time.
Sam DJ'd last night at the Lavo nightclub in the Palazzo . --TMZ has learned.