Naomi Campbell Manages to Upstage Kate Moss

It was a night of fabulous fun for Britain's finest including the likes of Rita Ora, Suki Waterhouse, and Keira Knightley. The A-listers of London stepped out to celebrate famed photographer Mario Testino at his 60th birthday bash on Wednesday. The flamenco-themed event, which took place at the Chiltern Firehouse, drew a number of stars who looked ready for a spin on the dance floor. Naomi Campbell and Kate Moss (who has really been partying it up lately) competed for best cleavage, while Sienna Miller showed off her fancy party dress. Read on to see the sexy stars who stopped by to honor their friend Mario. Getty / Mark Robert Milan