Acclaimed rocker Lou Reed has branded Sienna Miller a "whore" for agreeing to play Andy Warhol's muse Edie Sedgwick in upcoming biopic FACTORY GIRL.

THE VELVET UNDERGROUND star was close friends with Warhol after the met in New York City in the 1960s, and is horrified by the fictionalisation of parts of Factory Girl's plot - including a fictitious character.

He says, "There is no limit to how low some people will go to write something to make money. They're all a bunch of whores."