Katy Perry is just one of many stars to appear in the 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 'Glee's' Kevin McHale and Darren Criss, to 'Friday' singer Rebecca Black to - yep - Kenny G.

And if that wasn't enough, fans also got a more in-depth look at Perry's alter-ego, Kathy Beth Terry, who, suffice it to say, really needed that makeover.

Check out the video below, courtesy of PopCrush.