06/22/2011 08:18 am ET Updated Aug 22, 2011

Karissa And Kristina Shannon In Skimpy Workout Clothes (PHOTOS)

Hottie blonde sisters Karissa Shannon and Kristina Shannon moved back into the Playboy mansion, perhaps to fill the void left by the sudden departure of Hef's hide the Chicago-style hot dog game partner, Crystal Harris, who ditched him at the altar.

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