It's night and day on the fourth episode of "Shear Genius." Stylists must create two unique hairstyles that allow their models to go from daytime conservative to nighttime glamour. Later in the elimination challenge, the contestants must create a red-carpet hairstyle for a famous leading actress. Joining the judging panel from one of television's most popular shows, is the special guest judge Vanessa Williams, known for glamour on and off screen.