Where: The world premiere of Prometheus in London.
What: A Dior Haute Couture midnight blue bustier dress and black Dior shoes.
Why: After a slew of blood red and darkly gothic get-ups while promoting Snow White and the Huntsman, Theron seamlessly switched gears for the sci-fi Prometheus. The shimmering blue embroidery is subtly intergalactic, while the classic silhouette and sheer hemline keep it seductively feminine.
Photo: Getty Images