Why be blond or brunette, when you can be both? At least, that's the question we think could have been on Cameron Diaz's mind when she hit up a salon in Beverly Hills on March 23. The actress left with what appears to be lightened locks—or ombré, really, since her roots are still a darker hue. Diaz went mostly brunette just two weeks ago, when she was spotted out on a triple date night with hubby Benji Madden, Jessica Alba (with husband Cash Warren) and in-laws Joel Madden and Nicole Richie sporting a ponytail that showcased her rich chestnut shade. For this outing, Cam looked casual-chic in torn boyfriend jeans, a camo button down and nude sandals. Her darker hue was certainly...