The Playboy Mansion is alive with energy--and a whole lot of fresh faces! First, meet Hef's new trio of beauties: his new No. 1 girlfriend, 23-year-old Crystal Harris, and 19-year-old twins Karissa and Kristina Shannon. Learn about the new girls including their routines at the Mansion and how they ended up as Hugh Hefner's girlfriends! Plus, they also set the record straight about misconceptions the public may have about them, and open up about their childhoods. Also, follow the Shannon twins to Las Vegas for a Playboy magazine signing and see what happens when they meet up with Hef's former flame Holly Madison.