1. Katy Perry guest stars on How I Met Your Mother.
3. Katy Perry guest stars on How I Met Your Mother.
PHOTOS: Katy Perry On Set Of How I Met Your Mother
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 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
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PHOTOS: Katy Perry On Set Of How I Met Your Mother
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 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
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PHOTOS: Katy Perry On Set Of How I Met Your Mother
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 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
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PHOTOS: Katy Perry On Set Of How I Met Your Mother
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 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
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PHOTOS: Katy Perry On Set Of How I Met Your Mother
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 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
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PHOTOS: Katy Perry On Set Of How I Met Your Mother
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 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
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PHOTOS: Katy Perry On Set Of How I Met Your Mother
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 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
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PHOTOS: Katy Perry On Set Of How I Met Your Mother
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 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
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PHOTOS: Katy Perry On Set Of How I Met Your Mother
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 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
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