Angelina Jolie to Shakira: Celebrity UN ambassadors who've used stardom to promote social causes

George Clooney is a United Nations messenger of peace with a special focus on peacekeeping. He was designated with the title in 2008.

Nicolas Cage is a goodwill ambassador for the United Nations Office on Drugs and Crime.

Edward Norton is a United Nations messenger of peace with a special focus on biodiversity.

Michael Douglas is a United Nations messenger of peace with a special focus on disarmament.

Susan Sarandon is a goodwill ambassador for the United Nations Children's Fund as well as the Food and Agriculture Organization of the United Nations.

Antonio Banderas is a goodwill ambassador for the United Nations Development Program. He joined the UN in March 2010.

Gisele Bundchen is a goodwill ambassador for the United Nations Environment Program. Bundchen was designated in 2009 and since then she has been helping the UN to call attention to environmental issues. She has been the face of a number of UN campaigns, and undertaken field missions in Brazil and Kenya.

Shakira is a goodwill ambassador for the United Nations Children's Fund. The United Nations labour agency honoured internationally-acclaimed recording artist and humanitarian for her efforts to promote the advancement of children and youth worldwide in March 2010.

Katy Perry is a goodwill ambassador for the United Nations Children's Fund. Global pop superstar Katy Perry was appointed today by the United Nations Children's Fund (UNICEF) in December 2013, with a special focus on engaging young people in efforts to improve the lives of the world's most vulnerable children and adolescents.

Nicole Kidman is a goodwill ambassador for the United Nations Entity for Gender Equality and the Empowerment of Women. Kidman was appointed in January 2006.

Charlize Theron is a United Nations messenger of peace with a special focus on prevention of HIV and the elimination of violence against women.

David Beckham is a goodwill ambassador for the United Nations Children's Fund. The international football legend has supported UNICEF since 2005

Celine Dion is a goodwill ambassador for the Food and Agriculture Organization of the United Nations.

Jackie Chan is a goodwill ambassador for the United Nations Children's Fund. He hopped on board in April 2004.

Angelina Jolie is a special envoy for the United Nations High Commissioner for Refugees. After years of dedicated service to UNHCR and the cause of refugees, she was designated with the title in April 2012.

Liam Neeson is a goodwill ambassador for the United Nations Children's Fund. He joined the UNICEF in 2011.