Michelle Williams on the Other Side of Marilyn

Everyone is familiar with Marilyn Monroe, but according to Michelle Williams, who is playing the blonde bombshell in the upcoming My Week with Marilyn, there was a different side to Marilyn that was kept hidden from the public.

"How you commonly think of Marilyn Monroe -- that was a character," said Michelle. "That was a finely honed act that she put on and developed over time."

In the movie, Michelle plays Monroe during her 1957 London visit, when she was filming The Prince and the Showgirl with Laurence Olivier (played by Kenneth Branagh). The chemistry between the two screen titans was notoriously tense during their movie match-up, and Monroe was on her honeymoon with her new husband, playwright Arthur Miller.

The week in question refers to the time, after Miller left London, that film set assistant Colin Clark (played by Eddie Redmayne) introduced Marilyn to some of the pleasures of British life in an effort for her to get away from the pressures of Hollywood life.

"She, I think, is really remarkable as Marilyn," confessed Kenneth Branagh, who went on to describe a "chill-inducing moment" when the original script supervisor from The Prince and the Showgirl was taken aback by the overwhelming feeling of deja vu.

Watch the video for more. My Week with Marilyn hits theaters November 23.