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Hannigan and husband Alexis Denisof -- both of "Buffy the Vampire Slayer" fame, and he of "Angel" fame -- already have 2-year-old daughter, Satyana. Craig Thomas, executive producer and show co-creator, told the Chicago Tribune in 2009 that the writers just decided to make "an extra joke" out of Hannigan's impending tyke. "Why be subtle," he said.
This time, the pregnancy can just be incorporated into the storyline. In mid-May, "HIMYM" had Lily dealing with food poisoning, which, surprise, turned out to be the beginnings of a baby. Hannigan and actor Denisof, 45 have been Married since 2003.