Famous personalities are the getting the screen treatment nowadays, and bombshell Marilyn Monroe is no exception.

Playing the coveted role is Michelle Williams in the upcoming "My Week With Marilyn," which is based on two Colin Clark books.

It tells the story of Monroe's one-week stay on Britain while shooting her 1956 film, "The Prince and the Showgirl." Clark (played by Eddie Redmayne), an assistant on the set, takes her around the country for week as an escape from the hustle and bustle of work.

It wasn't easy for Williams to replicate Monroe's appearance. She gained a few pounds, donned a blonde wig and took hours in the dressing room just to put on make-up.

"I wasn't watching what I ate, let's put it that way," the 31-year-old actress tells People. She was sighted at the New York premiere of the film last Sunday. Her metamorphosis is also said to have included a bit of wardrobe trickery to help her on the body language part.

Director Simon Curtis says, "The costume designer and Michelle came up with some great stuff. But an awful lot is Williams' understanding of the way Marilyn walked, and the way Williams herself took on the wiggle."

Making the Marilyn magic work for her wasn't easy either. Williams studied the legend's films and songs, slowly adopting the flirty and breathy voice to go along with the gestures.

"I just tried to make her presence gradually and unobtrusively fill my life and my house," the "Blue Valentine" star told USA Today. "People didn't know, but it was for me to get my nerve up - little gestures that she had, or a little sway when I walked. So when I came on set, it wouldn't be the first time that I tested it in front of people."

And how did her co-stars react to her embodiment of the sex icon?

Dominic Cooper, who plays famous photographer Milton H. Greene in the flick, gushes on how realistic and fun it is to interact with her as Monroe.

"[It wasn't in] a way that made it uncomfortable or for people to get on with their jobs because sometimes that can cause friction and difficulties. But it was still very easy to have a conversation. You were just kind of doing it with Marilyn," he confided to E!.

However, there's one thing that still separates the two.

"The one way Michelle Williams did not embody Marilyn Monroe was that she showed up on time. Everything else, she seemed to get Marilyn and channel Marilyn," co-star Kenneth Branagh said.

By the looks of it, looks like Williams is really the perfect 2011 version of Marilyn Monroe.

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