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

Plot

Ben Stone (Seth Rogen) is a lazy, dimmwitted and immature 23-year-old Jewish Canadian and claimed illegal immigrant from British Columbia, living off funds received in compensation for an injury and sporadically working on a Mr. Skin-like website with his roommates in between smoking marijuana with them. Alison Scott (Katherine Heigl) is a career-minded woman who has just been given an on-air role with E! Entertainment Television, and is living with her sister Debbie's (Leslie Mann) family. While celebrating her promotion, Alison meets Ben at a local night club. After a night of drinking, they end up having sex. Due to a misunderstanding, they do not use protection: Alison uses the phrase "just do it" to encourage Ben to put the condom on faster, which he misinterprets as "forget the condom". The following morning, they quickly learn over breakfast that they have little in common and go their separate ways which leaves Ben visibly defeated when she walks away.

Eight weeks later, Alison experiences morning sickness at work, and, several home pregnancy tests later, discovers she is pregnant. She contacts Ben for the first time since their one-night stand to tell him the news. Although taken aback, Ben says he will be there to support Alison having the baby. While he is still unsure about being a parent, his father (Harold Ramis) tells him that he was the best thing that ever happened to him, given Ben's vision of his life is pretty sad to his father. Alison's mother (Joanna Kerns) tries to convince her daughter to have an abortion, but Alison decides to keep the child. Later, Alison and Ben decide to give their relationship a chance. The odd couple's efforts include Ben making an awkward marriage proposal with a ring box without a ring, promising to get her one someday. Alison thinks it is too early to think about marriage, because she is more concerned with hiding the pregnancy from her boss, who asked her when she first got the on-air job to be "firm" and "tight" for the cameras.

After a somewhat promising beginning, tensions surface in the relationship. Alison is increasingly anxious over Ben's lack of responsibility and has doubts about the longevity of their relationship. These thoughts race through her mind due to her sister's unhappy marriage. Debbie's husband Pete (Paul Rudd) works as a talent scout for rock bands, but he leaves at odd hours in the night which makes her suspect he is having an affair. Upon investigating, she learns that he is actually part of a fantasy baseball draft, which he explains that he needs to have some time free from Debbie's controlling manner (she had previously encouraged Alison to berate Ben until he remakes himself in her mold, calling it "training"). Similarly, Ben feels that Alison is overly controlling. As a result of Pete's confession to his wife, they decide to split up because Pete feels he cannot connect with Debbie and vice-versa. Alison is further convinced Ben will not be supportive after seeing he has not read books on child birth he had bought and promised to read earlier. While driving to the doctor's office, they erupt into a furious argument, resulting in Ben getting out of the car and walking the remaining three miles. Upon finally arriving, he blames her hormones for making her this way, and in response, she tells him that it would be better if they stopped seeing each other.