Hollywood actor Brad Pitt has become a special ambassador in Nelson Mandela's fight against HIV and Aids after a four-day fact-finding trip to Ethiopia.
Brad Pitt joins a growing list of stars involved in the campaign
"Aids is a tragedy that affects us all," Pitt said. "The world cannot be allowed to stand by any longer and just watch this disaster... unfold."
The star of Troy and Fight Club has been signed up for the former South African president's 46664 campaign.
Actors Will Smith and Robert De Niro are already special ambassadors.
Pitt was in Ethiopia from Friday to Monday for "a listening and learning visit" that involved visiting local health projects.
He called on people to "educate ourselves and our friends", and said pharmaceutical companies must make drugs more affordable and governments should give more funding to find a cure.
Ethiopian singer Tsedenia Gebremarkos, who met the actor, said Pitt was "very humble and really interested in the situation here".
More than 17 million Africans have died from Aids and another 25 million are infected with the HIV virus, according to lobby group Data.