Crystal Hefner says the rivalry between her and Holly Madison was concocted for reality TV. The former Playmate, 37, overtook fellow Playboy Bunny Holly, 45, as Hugh Hefner’s ‘No1 girlfriend’ after she moved into the Playboy Mansion, and has now hit out at producers of the E! show ‘The Girls Next Door’. Crystal, who was married to Hugh rom 2012 until his death in 2017, says in her new memoir: “They were trying, as usual, to whip up some rivalry between me and Holly Madison.” The “rivalry” between Crystal and Holly was on display in one of Crystal’s first scenes on the show, in which she was se…