Hugh Hefner, Crystal Harris: 60 year age difference! (VIDEO)

Hugh Hefner is taking "May-December Romances" to a new extreme, with a third marriage to very young "playmate" Crystal Harris. The two have a whopping 60 year age difference, but they both say there is no reason for anyone to question whether the relationship is real. Which is true, since it obviously isn't.

After buying her a $90,000 engagement ring the two are planning to marry this year. Said Harris of the relationship, that began at a Halloween party in 2008 where they first met, "We were both psychology majors in school, so there was never a dull moment. We always had something to talk about. We go to Vegas and stay at his suite at the Palms, we travel all over, and we've been to Europe. We have movie nights at home with all our friends, and I have a blast with him. He's the one with all the energy!"

They have since been steadily together, and with any luck, umm, they will continue having cordial photo-ops together for years to come! Ahh, the magic of true love.

Hugh Hefner, Crystal Harris: 60 year age difference! (VIDEO)
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It wasn't just that Hugh Hefner presented Crystal Harris with an engagement ring on Christmas Eve - it was how he did it that impressed her. "We were up in the bedroom," Harris, 24, tells PEOPLE, "and my favorite movie is The Little Mermaid, so he had the ring in a Little Mermaid box, and that was so special. I opened it and the first thing he said to me was, 'I hope it fits!' " Adds Hefner, 84, "I got her a little music box with the Mermaid theme to it, and it just looked like the perfect size and the perfect place to be the ring box. So when she started unwrapping that gift, I reached over and wound it so it was playing music while she discovered what was inside."

Hugh Hefner, Crystal Harris: 60 year age difference! (VIDEO)