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Kate Middleton and Pippa Middleton make my list as one of the most famous and well-dressed sister duos in the world. Even though Kate, as the Duchess of Cambridge, has to dress to impress, her lil sis Pippa is equally as fashionable. (Remember when her backside almost stole the spotlight at Kate's wedding?) Though the two now lead different lives, Pippa has said that she and Kate have a "normal, sisterly relationship" and like most sisters, they've worn similar outfits in the most serendipitous manner. Need proof? Ahead, 20 times Kate and Pippa #twinned so hard, I could hardly tell them apart. Don't ask me who wore the outfits better, though. I won't play favorites.