Watch a preview for Lifetime’s one hour special "Hef's Runaway Bride," where we take an intimate look at the events and conversations that led up to the breakup between Hugh Hefner, the world’s most famous bachelor, and Playmate girlfriend Crystal Harris, right before their wedding day. With exclusive interviews from Hefner and Harris, we will look back at the events leading up to their final moments together. Premieres July 19 at 10pm/9c on Lifetime.