Amanda Bynes Hit With DUI Charge

Bynes has been charged with one count of misdemeanor DUI -- and the D.A. has sought a sentencing enhancement because the actress refused to take either a breathalyzer or a blood test.

Bynes has not been charged with hit-and-run. If convicted -- with the sentencing enhancement -- we're told Bynes faces a minimum of 48 hours in jail ... and a maximum of 6 months.