Stars including Amy Winehouse, Leona Lewis and Razorlight will perform in London later to mark the 90th birthday of Nelson Mandela.
The concert, in Hyde Park, will also feature performances from Queen and Annie Lennox.
Proceeds from today's event will go towards the 46664 aids charity, which is campaigning to raise awareness of the severity of the disease.
As previously reported on Gigwise, Amy Winehouse is expected to perform with Jeremy Dammers of the Specials.
It will be her first public performance since she was diagnosed with traces of the lung disease emphysema.
US Hollywood actor Will Smith will host the concert and a host of special guests are expected to appear throughout the day.
The line up in pictures.
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