This is the American brand that Kate Middleton went crazy for last year

They can do no wrong.

The minute either Kate or Pippa Middleton step out, you can assure that whatever they're wearing will sell out. The majority of the time, it doesn't even take a week for the outfits to clear out of the shops and into Middleton-loving wardrobes. However, last year, the sisters seemed to be very keen on one brand in particular, and we have to say, we love it ourselves. Kate and Pippa couldn't stop wearing American designer, Kate Spade. Pippa was spotted wearing the designer on a number of occasions, including a white and blue striped dress on her honeymoon. Leading up to her wedding, she was also seen wearing various tweed coats and dresses by the designer. Kate is similar, wearing a printed pink midi-dress earlier this year, along with a number of coats and jackets. The designer currently has 40 percent off on its website right now, but you'll have to be quick before all the bargains are snapped up.