Scarlett Johansson & Katy Perry London - Arabstoday   After dyeing her hair red back in May, Scarlett Johansson showed off a fresh golden blonde shade while promoting her new movie, “We Bought a Zoo”, on the Today Show in New York City. Clad in a cobalt blue dress, the actress, 27, rocked a ladylike curled bob. And over the weekend, color chameleon Katy Perry, 27, debuted her latest look on Saturday Night Live. The pop star, who\'s gone from black to red to blonde to lavender and most recently to a mix of blonde and pink, is now sporting a pale blonde hue with a blue streak in the front. Perry also chopped off several inches of hair last week, working an edgy razored bob.