Paris Hilton's parents visited the socialite in prison yesterday (12Jun07) and were told she's cold and sleep deprived in jail. Rick and Kathy Hilton paid their first visit to Hilton's Twin Towers Correctional Facility home in Downtown Los Angeles and spent 30 minutes chatting to Paris through visiting-room glass. Her worried mum told reporters outside the prison, "It's tough in there. It's cold... She really hasn't had much sleep." But Kathy admits she's happy that her daughter is roughing it out: "She was very happy. She wants to just do her time and get on with it." Rick and Kathy Hilton are scheduled to visit their daughter again on Sunday (17Jun07). The hotel heiress, who is serving time for violating her probation on a 2006 drink driving arrest, is expected to be released for good behaviour on 25 June (07).