Jessica Biel and Scarlett Johansson channel a couple of classic Hollywood starlets in the upcoming biopic of Alfred Hitchcock -- here's a sneak peek at the pair's transformations into the two actresses of Psycho.

"Hitchcock dressed her up in a wig and did everything could to make the beautiful Vera Miles look frumpy. What Hitch tried to do to Vera we tried to do to Jessica, and the results were equally ridiculous. It is not possible to make Jessica Biel dowdy," said Hitchcock director Sacha Gervasi.

Scarlett, on the other hand, seemed to slip right into her role as Janet Leigh. "When we took that still of Scarlett behind the wheel and put it up against the still of Janet behind the wheel in Psycho, it was eerie. The extent to which Scarlett was able to channel Janet [was] a real surprise. She brought it in such a way that no one really anticipated," Gervasi said.

The film sees Anthony Hopkins as the famous auteur while Helen Mirren plays his wife and longtime collaborator, Alma. The film hits theaters on November 23.