Guess Who: Check Out Your Favorite Teen Choice Award-Nominated Stars Before They Were Famous!

Zachary Levi young yearbook high school photo

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Who Am I?

Zachary Levi young yearbook high school photo red carpet

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Zachary Levi—Choice TV Actor: Action; Choice Animated Movie: Voice

Zachary Levi has become a veritable King of the Nerds thanks to his NBC series Chuck. Before that, the former Buena High School student starred in the sitcom Less Than Perfect; here he is belting out Tina Turner's "Proud Mary." For a more current example of his vocal talents, check out this duet with Katharine McPhee.

Kim Kardashian young yearbook high school photo

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Who Am I?

Kim Kardashian young yearbook high school photo red carpet

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Kim Kardashian—Choice Female Hottie; Choice TV: Female Reality/Variety Star

She may be a middle sister, but Kim Kardashian is no Jan Brady. After graduating from Marymount High School in L.A., she's been riding reality show stardom to endorsement deals, a Vera Wang-designed wedding dress, and a 3-D magazine cover. Yes. 3-D. Yowza. Stop drooling, boys.

Will Ferrell young yearbook high school photo

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Who Am I?

Will Ferrell young yearbook high school photo red carpet

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Will Ferrell—Choice Movie Actor: Comedy; Choice Movie: Chemistry

Even when he was a student at University High School in Irvine, California, Will Ferrell had no problem doing anything for a laugh. Nowadays, "anything" usually means "getting naked and running around." Now, if you'll excuse us, we have to go work on our guns.

Katy Perry young yearbook high school photo

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Who Am I?

Katy Perry young yearbook high school photo red carpet

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Katy Perry—Choice Music: Single; Choice Music: Female Artist; Choice Music: Love Song

Turn on any radio and there's a 50 percent chance you will hear a Katy Perry song. Her latest hit, "Last Friday Night (T.G.I.F.)," is the fifth number-one track from the album Teenage Dream. She's also the voice of Smurfette in the upcoming summer flick The Smurfs. Not bad for a 26-year-old California girl from Dos Pueblos High.

Taylor Lautner young yearbook high school photo

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Who Am I?

Taylor Lautner young yearbook high school photo red carpet

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Taylor Lautner—Choice Male Hottie; Choice Movie Actor: Sci-Fi/Fantasy; Choice Movie: Liplock

Seems like only three years ago that Taylor Lautner was a sophomore at Valencia High School... because he was. Even before stealing hearts as Twilight's premier shape-shifter, Lautner worked his way up to werewolf with roles in Summerland (2004) and the singing superhero Sharkboy (2005). (If you only watch one clip, watch this one. Please. You will thank us later.)

Kaley Cuoco young yearbook high school photo

Who Am I?

Kaley Cuoco young yearbook high school photo red carpet

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Kaley Cuoco—Choice TV Actress: Comedy; Host

Kaley Cuoco got her start on TV in Quicksand: No Escape (1992) when she was just six years old. (We know this isn't a yearbook photo. But wasn't she cute?) She went on to star in Growing Up Brady and the sitcom 8 Simple Rules (2002-2005) and is now a certified geek goddess, thanks to her portrayal of the sexy and hilarious Penny on The Big Bang Theory. She's doing double duty as a nominee and host of the 2011 Teen Choice Awards.

Justin Timberlake young yearbook high school photo

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Who Am I?

Justin Timberlake young yearbook high school photo red carpet

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Justin Timberlake—Choice Movie Actor: Comedy; Choice Animated Movie: Voice; Choice Red Carpet Fashion Icon: Male; Choice Movie: Male Scene Stealer

Justin Timberlake was a star almost from birth. The former second grader from Tennessee's E.E. Jeter Elementary School showed homespun country charm on Star Search while still wearing short pants (okay, chaps), then grew up and brought sexy back. Now he slides seamlessly from drama to comedy on screens large and small.

Danica Patrick young yearbook high school photo

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Danica Patrick young yearbook high school photo red carpet

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Danica Patrick—Choice Athlete: Female

Racing fans know Hononegah High School's Danica Patrick for her mad skills behind the wheel. But it's the racy TV ads and photo shoots that put her third on Forbes' list of the highest-paid female athletes.

Brad Paisley young yearbook high school photo

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Who Am I?

Brad Paisley young yearbook high school photo red carpet

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Brad Paisley—Choice Music: Male Country Artist

Before he attended West Virginia's John Marshall High School, country star Brad Paisley reportedly got his start singing in church at the tender age of ten. He went pro at 13, and here's the proof—check out young Brad singing "Born on Christmas Day" from his album Brad Paisley Christmas (2006). His ninth studio album, This Is Country Music, was released on May 23, 2011.

Dianna Agron young yearbook high school photo

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Who Am I?

Dianna Agron young yearbook high school photo red carpet

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Dianna Agron—Choice TV: Female Scene Stealer

After graduating from Burlingame High School in 2004, Dianna Agron racked up a number of TV roles before breaking out in a big way on Glee. Check her out in this clip from Drake & Josh (2006) and this one from Heroes (2007), showing some early cheerleading chops.

Jennifer Lopez young yearbook high school photo

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Who Am I?

Jennifer Lopez young yearbook high school photo red carpet

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Jennifer Lopez—Choice Red Carpet Fashion Icon: Female; Choice TV: Personality

"Jenny from the Block" got On the 6 and rode it all the way to superstardom. Her classmates at Preston High School in the Bronx never thought she'd be the host of American Idol... but only because the show didn't exist back then.