Annie Liebowitz, famed Vanity Fair photographer, paired up an impressive roster of 21 celebrities on an unbelievable 20 magazine covers for this months upcoming "Africa" edition.

Each star is featured on two separate covers -- one on the receiving end and one passing the message on. It is described as a visual chain-letter and encourages us to keep talking about the global issues that are so magnified on the African continet. Other celebrities include Queen Ranier of Jordan, Condoleeza Rice, Don Cheadle, Iman, Muhammad Ali, and, of course, Bono, who edited the issue.

You can see all the covers and images from the photo shoots here and learn more about what you can do to help by clicking on the links below.

Related Causes:       Extreme Global Poverty

                             Malaria

                             HIV/AIDS

                             Genocide in Darfur

                             Millennium Development Goals