Prisoner 9818783 is on her best behavior, according to the latest updates from the jail where Paris Hilton is now leading the very simple life.

Steve Whitmore, a spokesman for the Los Angeles County Sheriff’s Department, which runs the Century Regional Detention Facility in suburban LA, told the Associated Press that “her demeanor was helpful, she was focused, she was cooperative.”

Whitmore said Paris, 26, had the usual jail breakfast on Monday: cereal, bread and juice.

Paris’s mother, Kathy Hilton, who brought her daughter to the facility on Sunday night, is trying to be resolute, according to Hilton’s publicist, Elliot Mintz.

Elliot Mintz tells the New York Post, “Kathy is very emotional. She wanted to exhibit strength for her daughter. She thought it was the most important thing to do. She thinks Paris will emerge from this a better person.”

Photo: AFP – A wax figure of Paris Hilton dressed in a black and white striped jailbird suit on display on the red carpet at Madame Tussauds, New York.