Irina Shayk Irina Shayk

Irina Shayk, a 25-year-old Russian model, has landed the coveted cover of the Sports Illustrated swimsuit issue.

The cover was revealed during Monday's Late Show with David Letterman when a sheet was removed to unveil a billboard version of the cover in Times Square.

"There were 10 models there to do the Top 10 List, and nobody knows until the last minute who the cover will be," Shayk said. "And then I saw it, and I couldn't believe it."

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Shayk, the girlfriend of soccer superstar Cristiano Ronaldo, has been in the swimsuit issue five previous times, but has never been on the cover.

Although it's tradition to keep the cover a secret until the airing of The Late Show, the image was accidentally revealed early Monday on Twitter by a woman who saw the unveiling for the taping.

Watch the reveal below.