To help celebrate the one year anniversary of 'Teenage Dream', Katy wanted to give you an exclusive look behind the party of the year! Hear from all the guest stars of the "Last Friday Night (T.G.I.F.)" video including
Kathy Beth Terry, Rebecca Blac, Darren Criss, Kevin McHale, Hanson, Debbie Gibson, Corey Feldman, (Uncle) Kenny G and Richie Nuzzolese as "The Jock".
Buy 'Teenage Dream' here on iTunes: http://goo.gl/g9Yba

Music video by Katy Perry performing Making Of Last Friday Night.
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