The film's plot centers around Jim Levenstein (Jason Biggs), who is about to get married to his girlfriend, Nadia (Shannon Elizabeth). However, things get complicated when Jim's friends, Finch (Eddie Kaye Thomas), Stifler (Seann William Scott), and Mike (Chris Klein), try to help him navigate his pre-marital jitters. Meanwhile, other characters deal with their own romantic and personal crises, leading to a series of humorous and sometimes heartfelt moments.