Besides supermodels like Kate Upton and Katherine Webb, the Sports Illustrated 2013 Swimsuit Issue features also four world-class athletes that interestingly enough are not involved in the (traditional) aquatic sports. Australian hurdler (and internet sensation) Michelle Jenneke, famed surfer Alana Blanchard, plus Dutch field hockey players Eva de Goede and Ellen Hoog.
I mean, she is pretty and all that, but that is beside the point :-)
Here is the video that made her a sensation. 21 million views and counting.
See Inside Sports Illustrated, no swimmer involved