Kathy Hilton was visibly upset after visiting her daughter yesterday, whose condition, as we xclusively reported, has apparently gotten worse. When we asked her how Paris was doing, she took a deep breath before answering "it's tough". Her parents' visit must have been a bright spot in Paris' week, though, Kathy described her daughter as being very happy to see her, putting her hands up on the glass that separated her from her mom as they talked.