Sometimes they look so alike they look like twins, and other times, well, they really are. There is the couple who walk the catwalks of the most important fashion shows together, and the one who, on the red carpet, has sometimes gone arm in arm. Then there are the heiresses who pioneered the most popular trends of the early 2000s, and the Argentines who in Italy have become real sexy icons, as well as the most talked about. And how can we not mention the queens of the news (and kitchens), and those who with social media have made a...