Actress Alyson Hannigan is pregnant! The "How I Met Your Mother" star and her husband, actor Alexis Denisof, are expecting their first child this spring. The couple met on the set of "Buffy the Vampire Slayer" and were married in 2003. Hannigan is also known for her role as band geek Michelle in the "American Pie" movies. Congratulations on the big news!

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