In fulfilling her promotional duties for Thor: The Dark World, actress Natalie Portman hit London in two beautiful looks. For her daytime interviews, Natalie chose a green knit dress that was made more special thanks to a sheer hemline and sleeves. She then completed her look with nude slingback Charlotte Olympia pumps and a pair of silver drop earrings. For the red carpet premiere of her flick, however, Natalie went the voluminous route in a silver metallic Dior maxi skirt balanced by a simple black top and black Charlotte Olympia pumps. Both looks are classic, but which Natalie Portman do you prefer — day or night?