The most stylish women of the past week has to be the new Mrs Paul McCartney. Last Sunday Paul made the American heiress Nancy Shevell his third wife, and she looked absolutely amazing. Wearing a knee-length, 1940s inspired dress created by her new daughter-in-law Stella, Nancy showed off the sort of ageless glamour that so many of todays starlets can only dream of. (Yes..I mean you, The Saturdays…) I tweeted about how fantastic I thought Nancy looked in that simple yet elegant dress, and was amazed at how many other people seemed to be of the same opinion. Words like timeless, chic and sophisticated were used, and everyone seemed incredulous…