Kate Upton posing in sexy bikinis

The Sports Illustrated Swimsuit Issue is published annually by Sports Illustrated. It features fashion models wearing swimwear in exotic locales. According to some, the magazine is the arbiter of supermodel succession. In addition, the issue is a media nexus that in 2005 carried US$35 million in advertising. New issues come out around the middle of February or later. First published in 1964, it is credited with making the bikini, invented in 1946, a legitimate piece of apparel. The issue that got the most letters was the 1978 issue. The best selling issue was the 25th Anniversary Issue with Kathy Ireland on the cover in 1989.