Sigourney Weaver, John C. Reilly and Alia Shawkat will join Ed Helms and Anne Heche in the Fox Searchlight comedy "Cedar Rapids," the Fox Miguel Arteta directs and filming has already begun.

Phil Johnston writes the screenplay which he developed along with Helms who plays a sad-sack insurance agent who goes to an industry convention to try and save the jobs of his colleagues.

Weaver is in as Helms' former seventh-grade teacher.

Weaver's up next in James Cameron's science fiction epic adventure "Avatar" which sees theatres in December. Reilly just wrapped "The Extrea Man" and Shawkat recently completed "The Runaways."

Alexander Payne is producing.