From TMZ: 

A Los Angeles County Superior Court judge has sentenced Paris Hilton to 45 days in L.A. County jail for violating her probation in a reckless driving case. Judge Michael T. Sauer handed down the harsh sentence, telling Paris she will not be allowed work release, furloughs, use of an alternative jail or electronic monitoring in lieu of jail. She must do the time!

An emotional Paris, with tears welling up in her eyes, told the judge moments before the decision “I’m sorry, I’m sorry.” Witnesses inside the courtroom say that Paris’ parents, Rick and Kathy Hilton, were both visibly upset as the sentence was handed down. Kathy, we’re told, was especially distraught.

The judge called out her rep Elliot Mintz in court, describing his testimony as “completely worthless.” He also told Paris that he did not believe that she was unaware of her license suspension, adding that she had paperwork in her car stating that her license was suspended.

Paris will serve her sentence at the Century Regional Detention Facility (CRDF). She will begin her sentence on June 5.

This is unreal to me… the thought of Paris going to jail.