The Duke And Duchess Of Cambridge Visit Poland - Day 1 [Getty Images]

WARSAW, POLAND - JULY 17: (NO UK SALES FOR 28 DAYS FROM CREATE DATE) Catherine, Duchess of Cambridge, Princess Charlotte of Cambridge, Prince William, Duke of Cambridge and Prince George of Cambridge arrive at Warsaw airport during an official visit to Poland and Germany on July 17, 2017 in Warsaw, Poland. (Photo by Pool/Samir Hussein/Samir Hussein/WireImage)

WireImage Pool/Samir Hussein