<p><br /> Hugh Hefner has proved age is no obstacle by proposing to his girlfriend, Crystal Harris, who is 60 years his junior.<br /> </p><p><br /> The Playboy tycoon popped the question on Christmas Eve and took to Twitter to announce the news.<br /> </p><p><br /> The following day Hefner wrote: "After the movie tonight, Crystal & I exchanged gifts. I gave Crystal a ring. A truly memorable Christmas Eve."<br /> </p><p><br /> The 84-year-old, whose divorce from his second wife Kimberley Conrad was only finalised in March this year, later confirmed what the ring was for.<br /> </p><p><br /> "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."<br /> </p><p><br /> 24-year-old Crystal Harris also took to Twitter to confirm the engagement and wrote: "The most memorable Christmas ever".<br /> </p>
