Singer Katy Perry came up with geeky alter ego named Kathy Beth Terry, a 13 year-old girl who wears braces and has no friends, for the upcoming music video for her new single “Last Friday Night (T.G.I.F)” off the “Teenage Dream” album (watch sneak peek below).

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Kathy Beth loves science, the solar system and social networking, but until she posted a viral video she had zero friends on Facebook. The “Last Friday Night” music video, which counts with the special appearance by the one and only Rebecca Black, best known as the “Friday” YouTube sensation, comes out June 14.

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Follow Kathy Beth Terry on Twitter and Facebook.

Katy Perry As Kathy Beth Terry In “Last Friday Night” Videos