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Katy Perry to Appear on How I Met Your Mother February 7

Katy Perry slated to appear on the February 7, 2011 episode of CBS's How I Met Your Mother. Neil Patrick Harris, star of the hit show who plays the character of Barney, Tweeted the video of Katy's appearance via Twitter. Harris wrote: "CBS just emailed me promose for the Katy Perry ep of HIMYM. Not sure if I'm supposed to tweet 'em yet. Oops."

Harris' clips include footage from Saturday Night Live-esque promotionals with humorous quips from the Teenage Dream singer and Harris in character as Barney.

To see the video, go here: TV Crunch

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