Alyson Hannigan and Alexis Denisof
Sylvain Gaboury/PR Photos
The How I Met Your Mother star, 34, and her husband, actor Alexis Denisof, 42, will welcome their first child this spring.
The couple met on the set of Buffy the Vampire Slayer during the 1999-2000 season and were married at the Two Bunch Palms resort near Palm Springs, Calif., on Oct. 11, 2003.
On the big screen, Hannigan is famous for her role as band geek Michelle opposite Jason Biggs in the American Pie trilogy.
• Leave your congratulations for Alyson and Alexis at PEOPLE's Celebrity Baby Blog
