Watch How I Met Your Mother Season 6 Episode 15 online via TV Fanatic with over 6 options to watch the How I Met Your Mother S6E15 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, and Verizon On Demand.
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Katy Perry guest stars on this episode of How I Met Your Mother. The singer comes on board as a woman who gets Barney to open up.