According to Britain's Daily Star, Miller has been having trouble with a transvestite stalker. A source told the newspaper, "Sienna has been bombarded with bizarre letters from a transvestite and has hired two security men. In his letters he talks about being obsessed with her look. He tries to follow her everywhere."

Sienna's transvestite stalker is named Peter and is said to be obsessed with the Edie Sedgwick, the '60s icon that Sienna portrayed in the film Factory Girl. Peter even dresses like Edie in fake fur coats, stilettos and dresses.

The source said, "The poor girl hasn't been sleeping properly because she has been so scared. Things just got to the point that she just had to take extra care of herself."