An attorney for Stephanie Pratt just pled not guilty on her behalf to a charge of misdemeanor DUI -- and her lawyer says the "Hills" star will check in to rehab.
Pratt's lawyer said she will enroll in a 30-day residential facility.
As we first reported, Pratt was pulled over at 3:45 AM on October 18 after leaving Holly Montag's birthday party.
Pratt's two breathalyzer tests registered .08 and .09 -- the legal limit is .08 -- so she was arrested and held on $5,000 bail.
If convicted, Pratt could face up to six months in jail and a $1,000 fine.
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