Michelle Williams dazzles in gold at screening of My Week with Marilyn

Michelle Williams dazzled in a structured gold gown at a screening of her new film 'My Week with Marilyn' at the 2011 American Film Institute Fest.

The 31-year-old plays the Hollywood legend in the film and would spend three hours a day being transformed into Marilyn Monroe.

However, the actress prefers to keep her pixie crop telling Elle: "'I've really grown into it - I feel like myself with short hair.

"And it's been a really long time since I had long hair, five years."

The film, which has been made for the TV by the BBC, portrays the seven days Monroe spent in England in 1957 to film 'The Prince and the Showgirl' with Laurence Olivier.

Olivier was reportedly so annoyed with Monroe's diva-like behaviour on set that he almost gave up directing the title, which would become a financial success.

Monroe died on 5 August 1962 at the age of 36 from an overdose of sleeping pills, which was deemed a suicide.