Watch How I Met Your Mother Season 7 Episode 17 online via TV Fanatic with over 7 options to watch the How I Met Your Mother S7E17 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Lifetime, and Verizon On Demand.
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Barney discovers something private about Marshall and Lily this week on How I Met Your Mother.