Kanye West is writing a movie role for Kim Kardashian.

The 'Stronger' rapper is teaming up with 'American Psycho' author Bret Easton Ellis to write a film based upon his latest album 'Yeezus' and sources say his fiancée will ''definitely'' be cast in a part.

An insider said: ''It's going to be based on the 'Yeezus' album. That's pretty much a narrative of Kanye's life.

''Kanye will not appear in the movie. Kim is definitely going to be in it. The screenplay already features her character.''

However, the 36-year-old singer - who has eight-month-old daughter North with the 'Keeping Up with the Kardashians' star - hasn't decided how big Kim's role is going to be.

The source told RadarOnline.com: ''They're still working on the script, so it's unclear at this point if Kim will be a major star of the movie or making a smaller cameo but her role in the movie will be pivotal.

''Her role is going to be very dramatic. Far from the bubbly happy persona that she's always played.''

Although Kanye won't be appearing in the movie himself he ''wants to be heavily involved in all aspects of production'' and will dedicate the film to his late mother.