Before starring opposite Sir Laurence Olivier in 'The Prince and the Showgirl,' Marilyn Monroe appeared with Ethel Merman and Donald O'Connor in Irving Berlin's 'There's No Business Like Show Business,' and brought the house down with her rendition of "Heat Wave." That song-and-dance performance is how the new film about Monroe, 'My Week With Marilyn,' begins, and while the scene isn't a shot-for-shot remake of the 'Show Business' classic, star Michelle Williams more than holds her own. In fact, she certainly can can-can. (Couldn't help it.) Watch below, but make sure to turn your thermostat down before viewing -- this clip could melt your computer.