Watch: Katy Perry Makes 'Teenage Dreams' Come True at High School Homecoming

Katy Perry may be one of the biggest music stars in the world, but she hasn't forgotten her roots! The singer performed a special show at her alma mater, Dos Pueblos High in Goleta, Calif. "This is one of my favorite shows I've ever played," she told ET. "That's because I think it's so unexpected and so over the top and fun ... What a thrill it was when the bell rang and you just saw a wave of kids ... and just like 'oh my gosh! this is amazing!'"

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