After filming a movie in Cambodia, actress Angelina Jolie began to visit refugee camps around the world. In 2001, she was named a goodwill ambassador by the U.N. Refugee Agency. Since then, Jolie has visited refugee camps in more than 30 countries, and she was appointed special envoy of the U.N. Refugee Agency in April 2012. Here are some other celebrities' forays into international diplomacy.