The SI Swimsuit issue has become an American icon but what is the greatest swimsuit cover of all time? We're leaving that for you to decide. Visit si.com/covervote and choose your five favorite covers. The winner will be unveiled in advance of the 50th anniversary swimsuit issue due out in February. Are you a Kate Upton fan? Do you prefer late '80s icons Kathy Ireland and Elle Macpherson? Is Christie Brinkley the apple of your eye? Vote today!!