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Sports Illustrated swimsuit model Irina Shayk arrives at the Sports Illustrated Swimsuit 24/7: SI Swimsuit Overtime at TAO Nightclub at the Venetian on February 12, 2010 in Las Vegas, Nevada.
Although the news is not supposed to officially be announced until the "Late Show With David Letterman" airs Monday night, a quick-acting girl with a cell phone camera snapped a shot of the billboard featuring Russian beauty Irina Shayk and leaked it on Twitter.
"I saw it from my office window," Rana Wardlaw told the Huffington Post. "I work at a media agency called Starcom Worldwide. They unveiled the billboard for a few minutes to tape it for the Letterman Show and then covered it back up. I guess they didn't cover it fast enough!"
Shayk's covers also include GQ Spain, GQ South Africa, and Elle Spain. This is her fifth appearance in Sports Illustrated. She will also make an appearance on NBC's Today show Tuesday morning.
She has been dating her soccer superstar boyfriend since 2010.