When Keira Knightley chose to step out on the red carpet of The Duchess premiere last night wearing a dress by relative unknown Alexis Mabille, it wasn't just the fashion world that she caught by surprise. Alexis had sent Keira a collection of his couture dresses last week but had no idea which the actress would chose to wear, if any. In fact, when we spoke to him this morning, he hadn't even seen pictures of his red carpet debut! So, of course, we emailed them to him in Paris. ‘I think she looked amazing,' Alexis told us exclusively. ‘The dress suits her fresh and light image, with that unique candid spirit of hers. The choice of the dark blue was just perfect for the red carpet. I was so glad when I saw the photos.' We bet you were. Which leaves us wondering what's going to happen to the other Alexis Mabille dresses she's got hanging in her Notting Hill pad? Coming to another red carpet soon, perhaps?