LOS ANGELES: Rihanna has obtained a restraining order against an obsessed stalker.  A judge has ordered Robert Melanson to stay at least 100 yards away from the ‘Stay’ hitmaker’s house and, or, place of business, after the 26-year-old male trespasser was caught creeping on her roof of her home, in the Pacific Palisades area of Los Angeles, earlier this month.  According to TMZ.com, Rihanna wrote she feared for her safety in legal documents because Robert is unstable and has a criminal history.  Although Rihanna was not home at the time of the incident as she was in the UK on her ‘Diamonds World Tour.–ES