Nude model and former girlfriend of Hugh Hefner Cristal Camden didn’t let her romantic past with the Playboy founder stop her from getting friendly with her successors Holly Madison, Bridget Marquardt, and Kendra Wilkinson and flaunting her flawless frame on numerous episodes on their E! reality show The Girls Next Door. She even appeared as a special guest on an episode of Marquardt’s spin-off show Bridget's Sexiest Beaches in 2009. What class. And what an ass!