Kate and Pippa Middleton
Who they are: Do we even have to explain? Kate is the very stylish Duchess of Cambridge, and her younger sister, Pippa, gained worldwide notoriety as quite possibly the hottest maid of honour in history.
Pippa's style is infinitely more laid-back than Kate's (understandable; Kate does have a few more people to impress), but both sisters share a taste for clean lines and impeccable tailoring. For a June 2011 wedding in England, the sisters arrived clad in knee-length sheath dresses with matching black pumps and fascinators.