TMZ has confirmed that Paris Hilton violated the terms of her probation last night when she was pulled over for driving on a suspended license, and could spend up to 90 days in jail as a result.

Hilton pled no contest to alcohol-related reckless driving after cops arrested her on September 7 for a DUI in Hollywood. As a result, the DMV suspended her license, and a judge placed Hilton on 36 months probation, with one major condition being: to "obey all laws."

Last night, Hilton was stopped around 10:30 PM after cops say they noticed Hilton speeding down Sunset Blvd. without headlights. Deputies then discovered she was driving with a suspended license, arrested the heiress and impounded her car.

A hearing will be set to discuss Hilton's violation.