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Princess Charlene of Monaco attends the "Water Safety" day for the drowning prevention on Larvoto beach in Monaco, on June 12, 2017. / AFP PHOTO / POOL / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)

Princess Charlene of Monaco attends the "Water Safety" day for the drowning prevention on Larvoto beach in Monaco, on June 12, 2017.   / AFP PHOTO / POOL / VALERY HACHE        (Photo credit should read VALERY HACHE/AFP/Getty Images)

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Princess Charlene of Monaco attends the "Water Safety" day for the drowning prevention on Larvoto beach in Monaco, on June 12, 2017. / AFP PHOTO / POOL / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)

Princess Charlene of Monaco attends the "Water Safety" day for the drowning prevention on Larvoto beach in Monaco, on June 12, 2017.   / AFP PHOTO / POOL / VALERY HACHE        (Photo credit should read VALERY HACHE/AFP/Getty Images)

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Princess Charlene of Monaco speaks to Monegasque free diver Pierre Frolla (L) during the "Water Safety" day for the drowning prevention on Larvoto beach in Monaco, on June 12, 2017. / AFP PHOTO / POOL / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)

Princess Charlene of Monaco speaks to Monegasque free diver Pierre Frolla (L) during the "Water Safety" day for the drowning prevention on Larvoto beach in Monaco, on June 12, 2017.   / AFP PHOTO / POOL / VALERY HACHE        (Photo credit should read VALERY HACHE/AFP/Getty Images)

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Princess Charlene of Monaco attends the "Water Safety" day for the drowning prevention on Larvoto beach in Monaco, on June 12, 2017. / AFP PHOTO / POOL / VALERY HACHE (Photo credit should read VALERY HACHE/AFP/Getty Images)

Princess Charlene of Monaco attends the "Water Safety" day for the drowning prevention on Larvoto beach in Monaco, on June 12, 2017.   / AFP PHOTO / POOL / VALERY HACHE        (Photo credit should read VALERY HACHE/AFP/Getty Images)

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Princess Charlene of Monaco flanked by Olympic swimmer Alain Bernard (L), attends the "Water Safety" day for the drowning prevention on Larvoto beach in Monaco, on June 12, 2017. / AFP PHOTO / POOL AND AFP PHOTO / VALERY HACHE (Photo credit should read VALERY HACHE/AFP via Getty Images)

Princess Charlene of Monaco flanked by Olympic swimmer Alain Bernard (L), attends the "Water Safety" day for the drowning prevention on Larvoto beach in Monaco, on June 12, 2017.   / AFP PHOTO / POOL AND AFP PHOTO / VALERY HACHE        (Photo credit should read VALERY HACHE/AFP via Getty Images)