Socialite Paris Hilton treated her dad Rick to a Father's Day surprise when her parents visited her Los Angeles prison on Sunday (17Jun07). Hilton is currently incarcerated at the Century Regional Detention Center in Lynwood, California for violating her probation on a 2006 drink driving arrest. The heiress' mother, Kathy, says of their Sunday visit, "(Paris is) doing well, she's doing very well. She's doing much better. She made (her father, Rick) a beautiful Father's Day card with his picture." Rick added, "It was (a very positive visit)."