14. Unlike so many young stars who get wrapped up in the glamour and gossip of Hollywood but forget to give back, Selena Gomez is a dedicated philanthropist. At 17 she became the youngest ever UNICEF Ambassador and she is also involved in DoSomething.org. She has dedicated her efforts and time to several charities ranging from St. Jude’s Children’s Hospital to The Ryan Seacrest Foundation, and from what we can see her work is just beginning.