Hugh Hefner SPLITS From Shannon Twins, 20

Hugh Hefner, 83, is down 2/3 of his girlfriends.

Late Tuesday Hefner tweeted that, "The Shannon Twins are growing up. They're moving to the Playmate House with my blessing so they will be free to do other things."

Kristina and Karissa Shannon, known as 'The Shannon Twins,' are 20 and have been dating the aging Playboy mogul for over a year.

They tweeted, "Were looking forward to moving to the Playmate House, But we still love Hef & want to remain close."

This means he is down to just one live-in girlfriend, December 2009 playmate Crystal Harris, 23.

According to Marc Malkin:

[Hef's] relationship with girlfriend Crystal Harris has been getting "more serious," the twins have expressed a lot of interest in doing more Playmate-related promotional work for the company...

"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 said. "They would like to be doing that, too."

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