The phrase "little black ... shirt dress is a cover-up that moonlights as an outfit. Add a belt if you want to fake a waist, or leave it open over a tank if you're feeling more casual-chic.

The star wore a white knit peplum mini dress by the clothing brand Self-Portrait (which is available now for $495) and white-and-black slingback pumps by Roger Vivier. She topped off the look with ...