Just days before they were to tie the knot at the Playboy Mansion, Hugh Hefner and Crystal Harris called off the nuptials. The couple who rang in the holidays with news of their engagement allegedly broke up after a nasty fight over the weekend. Hefner announced the wedding cancellation on twitter saying Harris had a change of heart. Hefner added that he would be screening the movie Runaway Bride at the Playboy Mansion on Saturday in place of the wedding reception that was scheduled. More than 300 people had been invited to the big day. This would have been the third marriage for Hefner and a first for Harris who is sixty years younger than the Playboy founder.