The waiflike beauty of Rooney Mara is the perfect centerpiece of this black-and-white commercial for Calvin Klein's new fragrance, Downtown. Directed by David Fincher, (who worked with the actress for "The Girl With the Dragon Tattoo") the commercial stars Ms. Mara as a Hollywood starlet with a very human side -- a sense of empathy and delight -- something that hasn't, we assume, been washed away by fame and fortune.