Madonna sinks flanked by the two Malawian children she adopted -- David Banda and Mercy James -- in a classroom at Mkoko Primary School, central Malawi, on April 2, 2013.
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Celebrity charity in Africa - Angelina Jolie —
UNHCR Goodwill Ambassador Angelina Jolie visits Somali refugees in Tunisia in April 2011.
Celebrity charity in Africa - George Clooney —
George Clooney attends the independence referendum vote in Juba, South Sudan, in January 2011. Clooney is co-founder of the Satellite Sentinel Project, which uses satellite imagery to watch for aerial attacks and troop movements in Sudan and South Sudan.
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Celebrity charity in Africa - Oprah Winfrey —
Oprah Winfrey poses with the graduates of the school she funded, the Oprah Winfrey Leadership Academy for Girls in Henley on Kilp, South Africa, in January 2012.
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Celebrity charity in Africa - Bono —
Irish rock star Bono leaves the Genadendal presidential residence after a meeting with the South African President Jacob Zuma in February 2011. Bono has worked on a number of humanitarian causes related to Africa.