Timeline: Paris Hilton's road to jail

September 7: Officers arrest Paris Hilton in Hollywood for investigation of driving under the influence after she was spotted "driving erratically."

January 9: Hilton's lawyers enter not guilty pleas on her behalf to one count each of driving under the influence and driving with a blood-alcohol level of .08 or above.

January 15: Hilton is pulled over by California Highway Patrol and informed that her license is suspended. She signs a document acknowledging she is not to drive.