Hayden Christensen was forced to play the only fictional character in new Andy Warhol/Edie Sedgwick biopic FACTORY GIRL because screenwriter Captain Mauzner couldn't guarantee Bob Dylan wouldn't sue if he alleged the rocker had romanced Sedgwick.

Christensen was excited about playing his rock hero in the film - alongside Guy Pearce and SIENNA MILLER - but, instead, he'll now play a character called DANNY QUINN.

The Canadian actor says, "(it was) a character originally scripted as Bob Dylan. They changed it to Danny Quinn to make it more ambiguous."