By now most of you would have seen Emma Watson's new ads for Burberry. So, why exactly did Christopher Bailey choose the Harry Potter star?

"Having known and admired the lovely Emma Watson for quite some time, she was the obvious choice for this campaign," he said. "Emma has a classic beauty, a great character and a modern edge. Her charm, intellect and brilliant sense of fun made the whole shoot feel like a picnic on the Thames. I felt [she] would be strong enough to hold the campaign as the only girl, and I loved the idea of her being surrounded by these young, cool British guys."

Nylon TV also recently caught up with the designer when he was in New York, to ask him what his worst fashion mistake is. Click play above to hear his answer.