‘Glee’s’ Kevin McHale and Darren Criss are just two of the many stars that appear in the new Katy Perry music video for her new single, ‘Last Friday Night (T.G.I.F.)’. In the video, which plays out like some type of homage to the 1989  movie ‘She’s Out of Control,’ fans are treated to appearances by everyone from  ‘Friday’ singer Rebecca Black to – yep – Kenny G, and many more.

And stick around to the very end for a more in-depth look at Perry’s alter-ego, Kathy Beth Terry ...

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