"I couldn't take 10 steps without having to throw up ... I didn't think I would make it through today," Hannigan told PEOPLE of a turbulent day before performing on Tuesday's 'Dancing with the ...

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.

Grab a slice and settle in for some nostalgia as we check in with Jason Biggs, Tara Reid, Seann William Scott and more stars from the 1999 hit American Pie. Alyson Hannigan revealed that she lost ...