This year's Sports Illustrated Swimsuit Issue has Kate Upton on the cover and it's caused quite the frenzy during the couple of weeks it's been out. Once again, SI nailed it with the perfect model for the front of its most celebrated issue, adding another success to the edition's untarnished repuation of almost 50 years. Instead of hauling through all 48 covers, though, why not go straight to the best ones? Check out The 25 Hottest Swimsuit Issue Covers Ever for the best history lesson of your life.

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