How I Met Your Mother Star Pregnant

There must be something in the water on the set of CBS' How I Met Your Mother.

Series star Cobie Smulders, 26, is expecting her first child with boyfriend Taran Killam, also an actor. Co-star Alyson Hannigan is also pregnant and is due in the spring.

Producers of the show were reportedly considering a baby storyline for Hannigan after news of her pregnancy broke. Hannigan's character is married on the show. Smulders is not.

Could newly eloped Heidi Montag and Spencer Pratt be next? The notorious reality couple recently filmed a guest spot on How I Met Your Mother. Horrors!