Kristina and Karissa Shannon (born October 2, 1989 in Ann Arbor, Michigan) are American glamour models, Playboy Playmates, and twin sisters.
In 2008, the Shannons moved into the Playboy Mansion as two of Hugh Hefner's three new girlfriends; because of their relationship with Hefner, the Shannons began appearing on the E! network reality television series The Girls Next Door. Despite their "girlfriend" status, Karissa said the relationship she and Kristina shared with Hefner was more for fun and the opportunity to be on the show, rather than romance. The first episode they appeared in attracted 2.4 million viewers, making it the most-watched season premiere in the show's history; five weeks after the premiere, ratings had dropped to 919,000.
The Shannons appeared as Miss July and Miss August 2009 in the combined "summer issue" of Playboy magazine, the double issue was necessitated by financial problems at the publisher. Unlike other previous centerfold twins, they managed to earn two consecutive months as Playmates, but shared a single centerfold. By January 2010, the Shannon twins moved out of the mansion, though they continued to appear in The Girls Next Door.