9. KRISTINA AND KARISSA SHANNON When Hef proposed to his number one girlfriend, Crystal Harris, twins Kristina and Karissa kindly moved out of the mansion and gave up their shared "girlfriend" title. However, based on TMZ and the Shannons' twitter, they've since moved back in. If he can't have Crystal, he should just re-up with this two-for-one package. Three-ways every night? My god.