Alyson Hannigan was pregnant while filming many season 4 episodes.
Most episodes used TV tricks to hide Hannigan's pregnancy, including baggy tops and giant handbags, even subplots like Lily winning a hot dog-eating contest.
Alyson Hannigan's White T-Shirt Miracle
Nothing is as versatile as the trusty white tee--done right, it can make all your spring stuff look totally fresh (without costing you a mint). See how it works on Alyson Hannigan, the adorable star of How I Met Your Mother.
The way they're there for each other.
It's going to be months before we get to kick off the final season of How I Met Your Mother. In preparation, we need to talk about all the ways Barney and Robin are LEGEN -- wait for it...