Playboy founder Hugh Hefner is engaged to girlfriend Crystal Harris after a Christmas proposal. Hefner Tweeted today: "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."

To clear up any doubts, Hef later added: "Yes, the ring I gave Crystal is an engagement ring. I didn't mean to make a mystery out of it. A very merry Christmas to all."

It will be the Girls Next Door star's third marriage. He married his first wife Mildred in 1949, with whom he had two children. That marriage lasted for ten years. In 1989 he wed Playmate of the Year Kimberly Conrad and they had two sons. They divorced last year but had previously separated.