Katy Perry's "T.G.I.F." Casts Lovable Cameos For All Ages 1Whitney Jefferson and 141 others eEditaDeleteBPromoteXDismissXUndismissbBlock for sitebHide Now that we know Katy Perry is a fully-trained thespian, let's take a look at her latest masterpiece in "T.G.I.F." Perry plays Kathy Beth Terry, her nerdy, thirteen-year-old alter ego, who accidentally throws the party of the year. Like, OMG! » 6/13/11 11:35am 6/13/11 11:35amKaty Perry Is A ThespianGet Ready For "The Summer Of Sax"