Katy Perry lets her nerdtastic alter ego Kathy Beth Terry loose in this new music video for “Last Friday Night (T.G.I.F.)”. The clip includes a couple of Gleeks (Darren Criss, Kevin McHale), 90s pop band Hanson, sax player Kenny G, Debbie Gibson and Corey Feldman play Kathy’s parents, and then there’s Rebecca Black (obviously). Like most of Katy Perry’s singles this one’s catchy, so beware. Now watch the star-studded video above!