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Katy Perry's guest appearance on the CBS comedy How I Met Your Mother is coming up Monday, but I know there are those of you who can't wait until then to see it.  Thanks to PerezHilton.com, he's got a couple of clips for ya to see.  Get to them right after the jump.

Monday night Katy Perry appears in an episode of How I Met Your Mother on CBS.  Above are the are 3 quick show promos that have surfaced on the net. Katy will be performing at the Grammy's on Sunday the 13th on CBS too and then head out on her Teenage Dream tour...

When Katy Perry's California Dreams hit s the Verizon Theatre in Grand Prairie on July 28th it'll definitely have an odor to it - an odor of cotton candy! "It's going to smell like you're in cotton candy heaven."  Katy tells the Rolling Stone.