Alison Brie will play the sister of Emily Blunt's character in the comedy. Jason Segel will play Emily Blunt's longtime fiancee. The movie will follow the highs and lows of a long-term engagement. It is also said that Alison Brie will speak in a British accent for the project.
Nick Stoller will direct from a script he co-wrote with Jason Segel, who co-starred and co-wrote Nick Stoller's 2008 comedy Forgetting Sarah Marshall. Judd Apatow will produce Five-Year Engagement with Shauna Robertson.
Production is scheduled to start towards the end of April, although it is unclear where filming will take place.