Music
The girl band recently cut short their reunion world tour, and Posh Spice Victoria Beckham said earlier this month that she was finished with the music industry.
However, officials believe the girls may be tempted to perform together one final time in tribute to the former president of South Africa.
A source told The Mirror: "Nelson is desperate for them to perform one last time - and he's confident it will happen.
"He first met the Spices in 1997 and called them his 'heroes', so he has deep admiration for them."
Other stars rumoured to be playing the concert include Jay-Z, Robbie Williams, The Rolling Stones and Rihanna.
The event takes place in London's Hyde Park in June.
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