Hugh Hefner doesn't grieve the loss of his girlfriends very long! Earlier today, we told you that Hef has finally admitted that he and Holly Madison have broken up. Now, meet the two ladies who have already moved into the Playboy mansion: Karissa and Kristina Shannon.

These two twins have appeared on the pages of Playboy, and evidently Hefner is ready to double his fun.

Hefner's most recent girlfriends (Holly, Kendra and Bridget) were all in their early twenties, so he's clearly going for a younger model with these two 19-year-old twins.

If you wanna see more pictures of Karissa and Kristina (NSFW), then click here.

When Holly and Bridget joined Hef's clan there were seven girlfriends, and he actually hints that he may expand his girlfriend selection again.

"It's a big house," he said. "And I'm not going to live alone. I'm definitely not going to live alone."

Oh and by the way - Hefner said Karissa and Kristina Shannon are living in the mansion, but they're aren't his girlfriends — yet.