Yum! Brands, Inc. (NYSE: YUM), the world's largest restaurant company with more than 36,000 KFC, Pizza Hut, and Taco Bell restaurants in more than 110 countries announced today that five-time Grammy Award winner Christina Aguilera is giving hunger a powerful voice by becoming the global spokesperson for World Hunger Relief. More on Yum! Brands, Christina Aguilera, and the World Hunger Relief