Hugh Hefner, The 84-year-old Playboy founder, whose divorce from second wife Kimberley Conrad became final last year, announced that he’s gotten engaged to 24-year-old girlfriend and Playmate Crystal Harris. Hef tweeted the news on Sunday, writing, "When I gave Crystal the ring, she burst into tears. This is the happiest Christmas weekend in memory...I got what I was hoping for for Christmas...Crystal's love."