The actress wowed crowds in a stunning floral Christopher Kane frock that won't appear on the racks until September.

The dress - part of Kane's autumn/winter 2010 collection - further galvanised the 19-year-old Brit's status as a young fashion icon. Pretty Emma turned heads as she left the swanky occasion, striking several model poses and flashing plenty of leg.

Emma - who plays Hogwarts swot Hermione Granger - split with JAY BARRYMORE this month after the relationship lost its magic.