What to Expect When You're Expecting is a 2012 American romantic comedy film directed by Kirk Jones and distributed by Lionsgate. It was written by Shauna Cross and Heather Hach and is based on Heidi Murkoff's 1984 pregnancy guide of the same name. Its story follows the lives of five couples as their lives are turned upside down by the difficulties and surprises of parenthood. It stars Cameron Diaz, Jennifer Lopez, Elizabeth Banks, Chace Crawford, Brooklyn Decker, Ben Falcone, Anna Kendrick, Matthew Morrison, Dennis Quaid, Chris Rock and Rodrigo Santoro.