The most popular of all Sports Illustrated issues, Swimsuit edition 2012 hits the Next Issue app today with cover model Kate Upton. Roughly 750k single copies were sold last year. That’s about 12x’s as many sold as the regular monthly issues.

Babette March was the first cover model in 1964 and Tyra Banks graced the cover in 1997 as the first African American woman. Look at the changes through the years. March seems the picture of modesty compared to the scantily clad Upton:

For more covers through the decades head to the SI Vault.