In one of the most "duh" moments of all time, infamous Internet sensation Rebecca Black has filmed a cameo appearance in the video for Katy Perry's new single, 'Last Friday Night (T.G.I.F.).'

The 13-year-old 'Friday' singer can be seen in the background in the teaser for Perry's music video, looking like she's having fun, fun, fun and thinking about the weekend.

The video also featured our first look at Perry's alter-ego, Kathy Beth Terry, whom you can friend on Facebook.

Check out the teaser below, then tell us: Is this a fun tongue-in-cheek nod to Rebecca Black? Or are you so over her?

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