The perky Emma Watson. Emma Watson at the annual Cartier International Polo Day, on July 27, 2008 in Windsor Great Park, Berkshire. No doubt cheering for England as they took on Australia. Drinking Pimms, a fruity cocktail laced with gin, at the same event. Emma Watson, who turned 18 on April 15, is one of the stars of the hugely successful Harry Potter movies. Watson is one of the