The 33-year-old DJ – who was arrested last Monday while driving her black Porsche back to Los Angeles from a gig in Las Vegas – has been charged with two counts of DUI, driving under the influence and driving with a blood alcohol level over .08.
If she were to be convicted, she could face six months in prison, but the majority of first offenders usually get probation, according to

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Samantha – who is best known for her relationship with Lindsay Lohan and as the brother of record producer Mark Ronson – was arrested at 10:30am after she refused to take a breath test when asked.
It is not the first time Samantha has suffered an incident on the roads in 2011.

In April, she was left with a bruised and cut face after she was knocked off her BMX bike while cycling home from a DJ gig in Los Angeles.