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The world premiere of Katy Perry's new music video, Last Friday Night features a ton of guest stars and some famous faces from your past. Buy the single now on iTunes here: http://goo.gl/WgBVc

Starring Katy Perry as Katy Beth Terry

Also Featuring: Rebecca Black, Darren Criss, Kevin McHale, Kenny G, Corey Feldman, Debbie Gibson and Hanson