Karissa and Kristina Shannon are ready for their time in the Playboy Mansion. The Shannon twins are gorgeous and soon may be in front of magazine readers and television viewers everywhere. While Karissa and Kristina Shannon are going up, one other relationship is headed straight down, Hugh Hefner is speaking out about his split from Holly Madison and he tells … [Read more...] about Karissa and Kristina Shannon Photos: Shannon Twins for Playboy and Hugh Hefner?