For a spread dubbed "Polar Bare" (that Sports Illustrated--sharp as a tack!), Upton finds herself without very many clothes on at all in the Antarctic tundra. In response to the reader uproar over Upton's overly-modest bikini top on last year's cover, the magazine apparently chose to do away with one altogether. A wise choice--though, as Upton tweeted yesterday, it took the 20-year-old "2 months to thaw out" after the shoot. Maybe she and Tierra from The Bachelor should start a support group for survivors of hypothermia?