Steve Martin and Diane Keaton are planning to star in 'One Big Happy', the new comedy from 'Party of Five' creators Chris Keyser and Amy Lippman.
Variety reports that the film tells the story of a couple and a family becoming close once again.
Paramount Pictures has acquired the rights to Keyser and Lippman's pitch.
The trade daily says that the deal was "in the high six figures".
