Bowfinger (1999)

Directed by Frank Oz, Bowfinger (1999) stars Steve Martin, Eddie Murphy, Heather Graham and Christine Baranski. Written by Steve Martin, the film follows struggling filmmaker Bobby Bowfinger as he attempts to make a Hollywood movie without the knowledge of the paranoid action star he wants as his lead actor. Set in the film industry, the story combines satire, farce and Hollywood ambition with misunderstandings and elaborate deception.

Från IMDB:
When a desperate movie producer fails to get a major star for his bargain-basement film, he decides to shoot the film secretly around him.