The Oscar-nominated actress is showing off her singing chops in just-released footage from the upcoming My Week With Marilyn, and if we didn't know better, we'd say it was the original blond bombshell herself!
Williams looks stunning while performing "Heat Wave," a song from Monroe's 1954 flick There's No Business Like Show Business.
The 33-year-old is a dead ringer for the late Hollywood icon in a sparkling nude dress with a thigh-high slit and Monroe's signature blond bob and red lips. Williams slinks around stage singing alongside several male dancers before blowing a flirty kiss to the camera.
"It's quite a dress to try to fill out," the pixie-cut beauty recently told us of channeling Monroe's sexy style.
We think you fill it out quite nicely, Ms. Williams.