NOW: Alyson Hannigan
Hannigan, now 40, also appeared in the "Pie" sequels, but found her greatest success on the small screen. From 1997-2003, she starred on "Buffy the Vampire Slayer," and recently ended her nine-year stint on the hit CBS series "How I Met Your Mother." Hannigan married actor Alexis Denisof in 2003. The couple has two daughters. —XFINITY Entertainment Staff (Photo: Frederick M. Brown/Getty)
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