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Hugh Hefner: Twins Moving Out of Playboy Mansion!

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And then there was one.

Two of Hugh Hefner's three girlfriends — 20-year-old twins Kristina and Karissa Shannon — are moving out of the mansion.

Related: See the baby photo of Hef's ex, Kendra Wilkinson - and more!

The Playboy founder, 83, tells E! News that his relationship with girlfriend Crystal Harris, 23, has been getting "more serious" and that the twins have expressed a lot of interest in doing more Playmate-related promotional work for the company. So they're moving into the neighboring Playmate House.

Related: Look back at all of Hugh Hefner's babes over the years!

"They've been hanging out with a lot of the other Playmates and they see these girls traveling across the country to do promotion," he says. "They would like to be doing that, too."

The move — which Hefner stressed will not affect their E! Show Girls Next Door — will take place within the next couple of weeks.

Related: Meet the new Girls Next Door stars!

"They thought it was a good idea," he said after he suggested the move to them. "They will now be friends, but they won't be defined as the girlfriends."

Related: See Hef in happier days with Holly, Bridget and Kendra

Now that he has Harris all to himself, will wedding bells be next?

"I haven't had a lot of luck with marriage," he says. "I don't have a good track record, and I don't want to screw this one up."

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