Katy Perry's alter ego Kathy Beth Terry is out in full force in the singer's new music video for "Last Friday Night (TGIF)."

The song's extended music video premiered on Funny Or Die over the weekend and finds the singer's nerdy alter ego getting a party makeover from neighbor Rebecca Black and having quite an unforgettable night.

Also making hilarious cameos are Darren Criss, Kevin McHale, Kenny G, Hanson, Debbie Gibson, and Corey Feldman. It's definitely a good time!

Check out the video below and let us know what you think! Watch out Rebecca Black, a new "Friday" anthem is taking over!

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