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MONACO, MONACO - JULY 21: Princess Charlene of Monaco cheers for countryman Wayde van Niekerk of South Africa during his 400m at the IAAF Diamond League Meeting Herculis 2017 on July 21, 2017 in Monaco, Monaco. (Photo by Jean Catuffe/Getty Images)

MONACO, MONACO - JULY 21: Princess Charlene of Monaco cheers for countryman Wayde van Niekerk of South Africa during his 400m at the IAAF Diamond League Meeting Herculis 2017 on July 21, 2017 in Monaco, Monaco. (Photo by Jean Catuffe/Getty Images)