Paris Hilton reportedly said that Nicole Richie's recent thinness is "really sad" and "not normal."

Paris Hilton and Nicole Richie are starring in the fourth season of their reality show ("The Simple Life 4: Till Death Do Us Part")- but don't expect to see the feuding former friends cozy again.

Hilton and Richie filmed their scenes separately, and now Hilton has blasted her ex-best buddy as "jealous" and "pathetic" - and has even said that Richie "looks horrible."

"She cannot stand being around me because I get all the attention and people really don't care about her,” Hilton said, reports IMDB.com. "It breaks my heart. She was my sister. She was the funniest, best person to be around and then she let fame go to her head. She's not the same person any more. I never want to speak to her again - ever." She continued: "I've been best friends with her since I was two, but when I brought her onto my show, she got very jealous and turned on me for no reason."