Hilton was given the sentence last week after violating terms of her 2006 drunk-driving arrest.
The jail-bound socialite is due to begin her stint behind bars on June 5, and while California Governor Arnold Schwarzenegger is keeping coy about her chances of a pardon, state authorities believe she will benefit from the packed prison cells, which have been described as "bursting at the seams."
Los Angeles County sheriff's spokesman Steve Whitmore says, "It's possible that (Hilton's sentence) could be 21 days, 23 days. It's a complicated formula that the state sets down. It's possible that she could do less time."
But Whitmore warns the 26-year-old she will not be receiving any preferential treatment.
He adds, "She will be treated like any other inmate who's classified as a low-level security risk."
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