You thought he'd marry 26-year-old Crystal Harris without one?
                                
                                
                                    (Newser) -
                                    If you had some romantic notion that Hugh Hefner, 86, and Crystal Harris, 26, are so in love that they  tied the knot  sans prenup, think again. They signed one three weeks ago, a source tells  Radar . The agreement protects Hef's assets from Playboy, and requires Harris to leave...