Paris Hilton has ditched Nicole Richie from the fourth series of their Simple Life TV show - after a joke went wrong. The blonde heiress had invited friends round to watch a video of her Saturday Night Live performance - but prankster Nicole reportedly put on Paris' infamous sex tape instead. After a massive row, the former best friends are said to be completely ignoring each other. Paris said: "It's no big secret that Nicole and I are no longer friends. Nicole knows what she did." The 24-year-old hotel millionaire is now drawing up a short-list of possible pals for...