Nathan Kress

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Kelly Osbourne

(credit: John Shearer/Getty Images for KCA)

Ariana Grande

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Keke Palmer

(credit: Christopher Polk/Getty Images for KCA)

Kelly Osbourne

(credit: Jason Merritt/Getty Images)

Rachel Crow

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Heidi Klum

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Travis Barker

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Jennie Garth

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Heidi Klum

(credit: Jason Merritt/Getty Images)

Victoria Justice

(credit: Jason Merritt/Getty Images)

Alexander Ludwig

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Josh Hutcherson

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Selena Gomez

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Katy Perry

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Kristen Stewart

(credit: Jason Merritt/Getty Images)

Emma Stone

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Jada Pinkett Smith and singer Katy Perry

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Kevin McHale

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Kristen Stewart

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