Here is the sequence of events that let to her stint in jail just to refresh memories:
In September 2006, Hilton was arrested and charged with driving under the influence with a blood alcohol content of 0.08%, the minimum at which it is illegal to drive in California. Hilton's drivers license was subsequently suspended in November 2006, and in January 2007 she pled no contest to the alcohol-related reckless driving charge.Her punishment was 36 months' probation and fines of about $1,500.
On January 15, 2007, Hilton was pulled over for driving with a suspended license and signed a document acknowledging that she was not permitted to drive. On February 27, 2007 Hilton was caught driving 70 MPH in a 35 MPH zone, again with a suspended license. She also did not have her headlights on even though it was after dark. Prosecutors in the office of the Los Angeles City Attorney charged that those actions, along with the failure to enroll in a court-ordered alcohol education program constituted a violation of the terms of her probation.
That's three, maybe four, violations of her probation.