The heiress was not present at today's hearing in a Los Angeles County courtroom, but an attorney representing Hilton entered the plea.
TMZ first reported that LAPD officers noticed Paris driving her Mercedes McLaren SLR erratically at 12:31 AM and stopped her. They believed she exhibited signs of intoxication. We're told they administered a field sobriety test, and Paris blew a .08. In California, driving with a .08 blood alcohol level is the minimum level for DUI.
Paris was arrested and taken to the LAPD Hollywood division, where she was booked.
Hilton is due back in court January 23.