As a budding Hollywood actress and the face of Burberry, Emma, 26, has become something of a fashionista.
When she was spotted wearing a dog-print cashmere scarf (£179 by British company Crumpet) in 2012, it sold out in less than a week — and sales at the company soared by 62 per cent over the next month.
And shoppers stripped H&M shelves of 20,000 checked shirts when Emma, taking time out from acting to get a degree, wore one for her first day at Oxford.
It happened again with the £486 Yves Saint Laurent army boots that she wore to a shop opening in New York. Within four days, they’d marched out of the shops.