Knocked Up is a 2007 American romantic comedy film written, produced and directed by Judd Apatow, and starring Seth Rogen, Katherine Heigl, Paul Rudd, Leslie Mann, Jay Baruchel, Jonah Hill, Jason Segel and Martin Starr. 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.