Knocked Up is a 2007 American romantic comedy film written, produced and directed by Judd Apatow, and starring Seth Rogen, Katherine Heigl, Paul Rudd, and Leslie Mann. It follows the repercussions of a drunken one-night stand between a slacker and a recently promoted media personality that results in an unintended pregnancy.

The film was released on June 1, 2007, to box office success, grossing $219 million worldwide, and acclaim from critics. This Is 40, a "sort-of sequel" focused on Rudd's and Mann's characters with Apatow returning as writer/director, was released on December 21, 2012.