This performance has "Oscar Winner" written all over it!

Transforming herself into one of the most iconic movie stars of all time, Michelle Williams flawlessly nails Marilyn Monroe as she performs “Heatwave” in the upcoming biopic, My Week With Marilyn.

While the two-time Oscar nominee was hesitant to take on such a larger than life role, Williams tells Vogue, "I've never been so hanging on a cliff waiting to hear what people think of a movie. I think after the second day, I told them they had to take away my passport because I was a flight risk."

Check out another just-released clip from My Week With Marilyn, which hits theaters November 23, after the jump ...