The Sports Illustrated Swimsuit issue, which debuted in 1964, has featured countless supermodels and athletes. Shop here for autographed SI Swimsuit issue photos, cards and magazines from Carol Alt, Amanda Beard, Christie Brinkley, Gisele Bundchen, Brooklyn Decker, Angie Everhart, Natalie Gulbis, Rachel Hunter, Kathy Ireland, Anna Kournikova, Danica Patrick, Daniela Pestova, Cheryl Tiegs, Caroline Wozniacki and more.