Even Mr and Mrs Ralph Lauren came! Sadly, Kate Middleton gave the charity dinner a miss (oh what we'd give for a fashion snap of the Duchess with Kate and Cara), but the mandatory dress war still went ahead.
Kate Moss at Prince William's party
Kate Moss hit the party with husband Jamie Hince, nailing the side-split dress.
Cara Delevingne at Prince William's party
Cara Delevingne joined the shindig with legendary fashion photographer Mario Testino, while rocking black sequins.
Margot Robbie at Prince William's party
Wolf Of Wall Street actress Margot Robbie wowed in metallic silver.
Cate Blanchett at Prince William's party
Cate Blanchett wowed in a one-shoulder white dress, with some mega earring bling.
Emma Watson at Prince William's party
Emma Watson's white shirt and skirt combo has divided opinion. Chic and understated, or a bit too school teacher?
Benedict Cumberbatch at Prince William's party
Benedict Cumberbatch suited up again, yay, to join Ralph and Ricky Lauren.
Who's your best dressed? Tweet us @handbagcom
KATE AND WILLIAM'S 'KIM & KANYE' MOMENT
THE KATE AND CARA CAMPAIGN HAPPENED
MORE SHOPPING AND FASHION NEWS