Hannigan has appeared as the sweet-but-raunchy band dork Michelle Flaherty in all four American Pie movies. Now firmly established in her success as Lily Aldrin on CBS’s How I Met Your Mother, Hannigan is married to actor Alexis Denisof and is currently expecting their second child. She is excited to return as Michelle in American Reunion. As she told Entertainment Weekly in 2011, “The great thing about this franchise is that, of course, there’s the raunchy humor, but there’s also a lot of heart to it. And this fourth movie does not miss the boat on that at all.”