Sarah Michelle Gellar and Alyson Hannigan chatted with ET on set of the 'Buffy the Vampire Slayer' episode, 'The Prom,’ in 1999. The 'How I Met Your Mother' star is proud of her success.

Celebrities - they're just like us! Alyson Hannigan stayed up to listen to Taylor Swift's newest album, The Tortured Poets ...

EXCLUSIVE: American Pie actress Alyson Hannigan, Nicole Grimaudo (Loose Cannons), Kim Coates (Sons of Anarchy, Godless), ...