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As if anyone needed convincing that Prince Harry has a brilliant sense of humour, his latest - very public - challenge to Usain Bolt has delighted his fans.

After the legendary sprinter, who also celebrated a landmark birthday on Sunday, received plaudits from around the world after his incredible OIympics triumph, the royal sent a message of his own.

Wishing the nine times gold medallist 'a happy 30th', the cheeky prince then challenged him to a rematch of their famous race in Jamaica in 2012.