What were the biggest videos on YouTube this year? I wonder who was in the top ten? Who could be number 1?!? Well, watch the video then. ;)

Here’s a behind the scenes video for the making of Katy Perry’s video for Last Friday Night (T.G.I.F), with special appearances by Kathy Beth Terry, Rebecca Black, Darren Criss and Kevin McHale from Glee, Hanson, Debbie Gibson, Corey Feldman and Kenny G!