Sam Ronson has been charged with misdemeanor DUI ... TMZ has learned -- this, after she was arrested last week while driving back from Las Vegas.
The San Bernardino County D.A. has charged Sam with two counts of DUI -- driving under the influence, and driving with a blood alcohol level over .08. The two charges are SOP.
If convicted, Sam faces a maximum of 6 months in jail and a $1,000 fine, but first offenders almost always get probation.
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