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MONACO - AUGUST 28: Princess Charlene of Monaco and Princess Gabriella arrive to attend the annual traditional 'Pique Nique Monegasque' on August 28, 2015 in Monaco, Monaco. (Photo by PLS Pool/Getty Images)

MONACO - AUGUST 28:  Princess Charlene of Monaco and Princess Gabriella arrive to attend the annual traditional 'Pique Nique Monegasque' on August 28, 2015 in Monaco, Monaco.  (Photo by PLS Pool/Getty Images)