"She's already got a very high profile in the States but this shoot will propel her on to an altogether different planet," the Mirror quoted a source as saying.
“It's very high-end, stylish and she looks amazing. Susan loved trying on all the designer dresses and even had her hair tinted for the occasion. The director was more than happy for her to look as she does on the telly but Susan wanted to try something different," the source added.
Boyle had recently appeared on appeared on US chat show Today. Asked by the host if she'd had a makeover, Susan grinned and replied: "Just a slight one. I brush up quite well." She added: "Being plucked from obscurity is like going on a long journey. You never know how it's going to end. I don't want it to end. I'm having a great time. It's been unbelievable. It's indescribable."