The Harry Potter star was awarded the style icon gong by British British design legend Vivienne Westwood at the London bash.
Elle editor Lorraine Candy praised the star for her approach to fashion.
She said: 'She’s got a very distinct individual look. We always say at Elle, 'It's not what you wear, it's the way you wear it' and she's got such spirit, Emma. I think that makes her stylish.'
