Angela Jolie--Power Giver

Cause: Helping refugees, disaster victims, orphans. Jolie, 31, began work with the U.N. High Commissioner for Refugees in Sierra Leone in 2001, the year she became a goodwill ambassador. She has put her time, influence and millions of dollars into helping people in Sudan, Chad and Thailand.

Impact: She donates one-third of her income to charity, and her three adopted children—Maddox, Zahara and Pax—are examples of her continuing commitment to helping those in need.

More of Angela Jolie's work with the organization, Global Action for Children:

Now Angelina has passionately joined forces with GAC, dedicating time, money and emotion to the cause. “My daughter Zahara was orphaned because of AIDS,” she told the audience in Washington, “So I don’t have to tell you how precious I think these children are.”