Hugh Hefner revealed this week how he tells 19-year-old twin girlfriends Karissa and Kristina Shannon apart: Karissa has a mole on her neck. The pair will be featured on the next season of "The Girls Next Door." Mike Guastella/WireImage.com - July 13, 2009
Week In Photos: July 13-19, 2009
Miss any of the hot celebrity stories from last week? Get caught up with the Week in Photos.