HOLLYWOOD megastar Tom Cruise is furious royal biographer Andrew Morton is using a gay porn actor to investigate his private life. Friends of the movie star said yesterday Morton had "sunk to a new low". Morton, who collaborated with Princess Diana to produce an account of her troubled life, is paying 58-year-old Paul Baressi to help him with his warts-and-all book about Cruise. Baressi has starred in 25 gay porn films but now works as a private investigator in LA. "I am a key source of information regarding several things," Baressi said. Baressi claims to have provided Morton with documentation...