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Video: Sports Illustrated Swimsuit Rookies

It started in 1964 as a way to maintain interest for its readers during the heart of winter and now, the Sports Illustrated swimsuit issue has become a worldwide phenomenon.

The much-anticipated issue is seen by 60 million people each year and has launched the careers of many, including Heidi Klum, Christie Brinkley and Kathy Ireland.

On "The Early Show," five women who are making their debut in the latest swimsuit issue -- Shannan Click, Kenza Fourati, Izabel Goulart, Alyssa Miller, and Kate Upton -- talked about what it's like to be "rookies."

PICTURES: SI Swimsuit Cover Girls
Sports Illustrated Swimsuit Cover: Irina Shayk
Irina Shayk graces this year's cover.

Click on the video below to see the models in action.

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