Lily Collins was glamorous and sophisticated at the GO Campaign Gala held in Los Angeles, and showed off skin in a backless gown.
The British actress wore a halter-neck shimmery black gown that clung to her body, and was cinched in at the waist with a skinny black belt.
Lily, 27, mesmerised as she struck an over the shoulder pose, and put her toned and lean figure on display.
The brunette actress added a pair of strappy black heels to the outfit, and had her hair styled in large loose curls.
A ruby-red lip colour was also worn by Lily, who topped off her style with lashings of mascara and a shimmery eyeshadow.