Steve Martin and Dianne Keaton have joined the upcoming comedy One Big Happy. According to Variety, the film comes from a comedy pitch Party of Five creators Chris Keyser and Amy Lippman sold to Paramount Pictures. Both John Goldwyn and Saturday Night Live's Lorne Michael's have signed on to produce the project.

While the plot of the film is being kept under wraps, Paramount has describe One Big Happy as a family comedy that centers on a couple reconnecting amidst various obstacles. Steve Martin and Dianne Keaton will be reuniting on the big screen for the first time since they played a married couple in the Father of the Bride films.

The project does not have an official start date at this time.