Hugh Hefner thought his Girl, Kendra Wilkinson, was tough. But his gangsta gal was a pussycat compared to twins Kristina and Karissa Shannon, 19, who are now living in the Playboy Mansion! According to TMZ.com, the “Girls Next Door” successors were both busted by St. Petersburg, Fla., cops in January for felony aggravated assault. And they were ordered to pay restitution to two victims. Karissa also has a misdemeanor battery charge on her record from 2007. Playboy had no comment. As you are so aware by now, Hef’s inamorata, Holly Madison, and Kendra have moved out of the mansion although they, along with Bridget Marquardt, are still filming the popular E! series.