Demi arrived arm-in-arm with Kate Hudson at the renowned jewellery firm's Fifth Avenue store, with both actresses opting to play it safe by wearing little black dresses.
While Demi chose to belt her knee-length asymmetric number, Kate showed off her slender figure in a daring cutaway floor-length gown teamed with Cartier jewels.
Anne made a rare fashion faux pas, teaming her stunning midnight blue mini dress with opaque tights, while Jessica's choice of a casual khaki maxi-dress teamed with a leather jacket was in stark contrast to her boyfriend Justin Timberlake's three-piece grey suit, and to the lavish gowns worn by her Hollywood contemporaries at the bash.
Eva Mendes shone in a metallic long-sleeved gown matched with sky-scraper heels, while Rachel Weiss looked beautiful in a cream strapless prom dress with black ruffled detailing and dark accessories.
Sir Elton John opted for a simple black suit, in contrast to Amanda Bynes who shunned muted tones and monochrome in favour of a vivid pink number.
