A slacker (Seth Rogen) and a TV presenter (Katherine Heigl) have a drunken one-night stand. But when it turns out that she is pregnant, the unlikely couple try to make it work for the good of the baby. Co stars Paul Rudd, Leslie Mann and Jonah Hill.

Film Trivia

• Director Judd Apatow has claimed that this film is partly based on the birth of his first child with his wife Leslie Mann.
• In Brazil this film was released as Slightly Pregnant and in Russia it was released as A Little Bit Pregnant.
• Christina Aguilera was offered the role of Allison but she turned it down to focus on her music career.
• The majority of the dialogue was either improvised by the actors or Judd Apatow fed the lines to them moments before the scene began.
• This film marks Seth Rogen's first leading role in a movie.

If you like Knocked Up, try these:

• I Love You, Man
• Observe & Report
• Management