Head & Shoulders -- Alyson Hannigan Behind the Scenes Ad Shoot

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Alyson Hannigan, star of CBS' How I Met Your Mother and American Pie, is going to help girlfriends everywhere fight against head scratching behaviors. As Head & Shoulders' official female ambassador, Alyson will go beyond giving women advice on how to get great looking hair -- she's helping the brand to create The Good Girlfriend Guide, an e-manual of positive girlfriend-to-girlfriend advice that tackles everything from beauty faux pas to relationship blunders. Go behind the scenes with Alyson at her first ad shoot and see what she thinks about being a Good Girlfriend. For more on Alyson and the Guide, visit www.facebook.com