Karissa Shannon has a twin sister named Kristina. Together, they dated Hugh Hefner for awhile and got famous.

Then, they moved out of the Playboy Mansion, but Karissa wasn't finished making a name for herself by having sex: in the summer of 2010, it came out that she made a sex tape with Heidi Montag. She even admitted this!

As you might expect, Karissa has posed naked in this men's magazine. She hails from Michigan.