Angelina Jolie has been showing her glamorous side lately – walking the carpets from Cannes to Tinseltown – but Thursday she was honored for her philanthropic work by joining the Council on Foreign Relations, PEOPLE has learned exclusively. The prestigious think tank officially approved Jolie's membership nomination, adding her to a group whose membership includes presidents Bill Clinton and Jimmy Carter, ABC's Diane Sawyer, Secretary of State Condoleezza Rice and journalist Tom Brokaw. Earlier this year, Jolie, already a UN Goodwill Ambassador, was nominated and recommended for approval by the CFR membership.