We learned last week that Anne Heche would be joining Ed Helms and John C Reilly in Miguel Arteta's comedy Cedar Rapids, but the film has now picked up Sigourney Weaver for the ride. The words "momentum" and "gathering" spring to mind.

A starring role for the previously-always-supporting Helms, following The Hangover, it's about a smalltime insurance salesman attending a big industry conference in the titular Iowan town. Reilly is a fellow salesman, using the convention as a holiday to blow off some steam away from the folks. Heche is the female lead who befriends Helms when everything goes horribly wrong. Whip It's Alia Shawkat is on board in an as-yet-unspecified role. And Weaver, according to Variety, will play Helms' former seventh-grade school teacher.

Sounds like a cameo then: maybe a stop along the road trip. But along with Avatar, You Again and Paul, it's great to see Weaver so busy at the moment.