Sam Ronson was arrested yesterday morning for DUI outside Baker, Calif.

She either had too many mimosas or one heck of a time the night before!

According to the booking sheet, obtained by TMZ, the 33-year-old DJ and former GF of Lindsay Lohan is listed as 5'7" and 102 pounds.

Police sources say Ronson was driving home from Las Vegas at 10:30 a.m. in her black Porsche when she was pulled over for speeding.

She was given a field sobriety test and didn't perform well.

Samantha Ronson then refused to take what is called a "roadside blow," a less scientific breathalyzer (non-mandatory) test and was arrested.

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

Sam DJ'd the previous night at Lavo nightclub in the Palazzo in Las Vegas. No new additions to our gallery of celebrity mug shots ... yet.