VIDEO: From Dud To Stud - See The Situation Back In High School

Before he was flashing his abs on red carpets coast-to-coast, Mike "The Situation" Sorrentino was something of an ugly duckling.

Watch the clip on RadarOnline.com

The Jersey Shore heartbreaker appeared on The Tonight Show with Jay Leno Tuesday, and Leno had a blast from the past waiting for the MTV star: his high school yearbook photo. The picture shows Sorrentino, a magazine cover boy now, fighting what looked to be a bad case of acne and an even worse haircut -- think Napoleon Dynamite with a touch of GTL.

"I'm surprised you didn't get an acne commercial," Leno teased.

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Sorrentino responded: "At that point in his career, The Situation was on the way up ... he needed a little improvement."

"You couldn't have gotten much lower!" Leno said.

Sorrentino said that he was actually a popular kid in high school, and voted “Best Body” and “Biggest Flirt” by his class.

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The new season of Jersey Shore premieres on MTV Thursday, July 29 at 10/9c.