By ANDREW DALTON AP Entertainment WriterLOS ANGELES (AP) — Kim Kardashian and her mother, Kris Jenner, are suing her ex-boyfriend Ray J for saying they are under federal investigation and on the verge of being indicted. The defamation lawsuit filed in Los Angeles Superior Court on Wednesday by the reality TV stars and businesspeople is a fast and aggressive pushback against allegations they say are entirely baseless. They say Ray J, whose legal name is Ray Norwood Jr., falsely claimed that he was working with federal investigators on a racketeering ckase against them that will soon lead to their indictment. The lawsuit says Ray J’s comments are part of a “sustained campaign of harassment and defamation” that has gone on for years. Ray J is a singer, actor and brother to pop star Brandy.