Watch Katy Perry Get Nerdy in 'Last Friday Night (TGIF)' Music Video Tease

Braces, vomit and Rebecca Black? If those things sound exciting, then you'll definitely want to check out the teaser for Katy Perry's latest music video! The California Gurl released a 30-second snippet for "Last Friday Night (TGIF)," the latest (and fifth!) single off herTeenage Dreams album. The full video won't be released until June 14, but the teaser for the music video...