American Wedding

Release 2003

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Director: Jesse Dylan
Writers: Adam Herz
Stars: Jason Biggs, Seann William Scott, Alyson Hannigan, Eddie Kaye Thomas, Thomas Ian Nicholas
IMDB: http://www.imdb.com/title/tt0328828/

It's the wedding of Jim and Michelle and the gathering of their families and friends, including Jim's old friends from high school and Michelle's little sister.