It appears that Hugh Hefner and girlfriend Crystal Harris--who's 60 years his junior!--are taking their relationship to the next step, and are engaged: The Playboy kingpin Tweeted Christmas Eve that he gave Harris a ring.

The 84-year-old Playboy CEO tweeted, "After the movie [The Tourist] tonight, Crystal & I exchanged gifts. I gave Crystal a ring. A truly memorable Christmas Eve." So it seems Hefner and his 24-year-old "Number One" girlfriend are chapel-bound!

Hef has been married twice before: To Mildred Williams from 1949-1959 and Kimberly Conrad from 1989-2010.

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