Although their fans probably prefer them in barely-there bikinis, Sports Illustrated Swimsuit models also happen to look pretty amazing all decked out in designer dresses (albeit, very short, tight ones).

At the launch party for the much-anticipated 2012 issue in New York City Tuesday night, several of the magazine's stunners showed up to celebrate cover girl Kate Upton.

PHOTOS: Kate Upton's hot body

The 19-year-old blonde bombshell showed off her incredible curves in a red off-the-shoulder dress with black Christian Louboutin heels.

To prepare for the shoot, Upton worked out with a trainer almost every day for at least an hour and ate "just oatmeal, salad and protein," she told Us Weekly.

PHOTOS: Hollywood's hottest bodies

Upton's predecessor, Irina Shayk, posed in a white-hot strapless mini and glittery heels. The 26-year-old Russian stunner accessorized with bold red lips and a statement choker necklace.

The sexy duo were joined by Israeli beauty Bar Refaeli, 26, who wowed in a sky blue one-shoulder lace Emilio Pucci mini, and Chrissy Teigen, also in an asymmetrical lace mini.

PHOTOS: Love lives of supermodels

Teigen, 26, who's engaged to singer John Legend, confessed to Us that she hit the gym "every single day for a couple hours" and ditched carbs to get her body bikini ready.

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