Major changes shook up the Playboy Mansion last season when Holly, Bridget and Kendra said goodbye and moved out of the famous address they once called home. But now a new chapter of "The Girls Next Door" begins as three

Playboy Magazine's Miss July/August 2009 Double Issue Playmates of the Month Karissa and Kristina Shannon signed autographs at the Playboy Store in Las Vegas on Friday. What do you think of Hugh Hefner's hotties? See more photos after the jump...

Hollywood royalty used to use body doubles for filming sex scenes in their films; the thought of them baring it all was almost a joke. But as sex and nudity have taken a more artsy approach on screen, celebrities are jumping at the chance to take their careers to a more risqué level...