Starring Julia Roberts and Bruce Willis what is the movie within a in The Player?

The movie within a movie in "The Player" is called "The Player".

It's a fictional film-within-a-film that the main character, Griffin Mill, is trying to get made. The movie is a dark comedy about a Hollywood producer who gets caught up in a murder mystery.

While the film does mention Julia Roberts and Bruce Willis in a passing conversation, they are not the stars of "The Player" within the movie.