And despite mixed reviews, the Elle Macpherson-hosted show manages an innovative feel by borrowing bits and pieces from existing series.

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Elle Macpherson has been on the cover the most, with five appearances.

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While there's been no shortage of celebrities launching their own lingerie lines (with Kylie Minogue's Love Kylie and Elle Macpherson Intimates being among the most successful), creating a "total lingerie-shopping experience" has taken a little longer.

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Upton is now a two-time cover girl, the first to be a solo two-timer since Elle Macpherson went back-to-back-to-back from 1986-1988, and only the 14th woman to appear on the cover at least twice since the issue began in 1964.

FORBES: The Economics of SI's Swimsuit Models: Where Bikinis and Business Align

Starting with Cheryl Tiegs in the 1970s, and then followed by Christie Brinkley, Elle Macpherson, and Kathy Ireland, dozens of companies ranging from the beauty, auto, and clothing industries have seen their profiles enhanced by hitching their wagons to a select group of stunning women.

FORBES: The Economics of SI's Swimsuit Models: Where Bikinis and Business Align