Katy Perry has released bonus material for her 'Last Friday Night (T.G.I.F)' video in which she plays a geeky thirteen year old called Kathy Beth Terry.

The singer recently set up a Twitter and Facebook account for Kathy Beth, both of which have gained tens of thousands of friends and followers.

The bonus clips feature inter­views from various char­ac­ters that appear through­out the video, including Kathy Beth Terry herself.

The video for the track, which premiered today, also stars Rebecca Black, Kenny G, 90s boyband Hanson and Glee actors Kevin McHale and Darren Criss.