David Gordon Green will direct the film, which is currently shooting and scheduled for release in July 2011.
Hill will play a college dropout who is asked to babysit three rambunctious children. When he ends up buying drugs (Rockwell will play the dealer) to impress a girl (Ari Graynor), the deal goes around and he – and the kids – are chased around New York.
Rockwell appeared Off-Broadway in The Last Days of Judas Iscariot and Goose-Pimples, and onscreen in "Iron Man 2," "The Assassination of Jesse James…," "Frost/Nixon," "Confessions of a Dangerous Mind" and "The Hitchhiker's Guide to the Galaxy," among others.
Graynor, who recently appeared Off-Broadway in Trust, has appeared on Broadway in The Little Dog Laughed and Brooklyn Boy.