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HEIDELBERG, GERMANY - JULY 20: (NO UK SALES FOR 28 DAYS FROM CREATE DATE) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge make pretzels as they tour a traditional German market in the Central Square during an official visit to Poland and Germany on July 20, 2017 in Heidelberg, Germany. (Photo by Pool/Samir Hussein/WireImage)

HEIDELBERG, GERMANY - JULY 20:  (NO UK SALES FOR 28 DAYS FROM CREATE DATE) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge make pretzels as they tour a traditional German market in the Central Square during an official visit to Poland and Germany on July 20, 2017 in Heidelberg, Germany.  (Photo by Pool/Samir Hussein/WireImage)

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HEIDELBERG, GERMANY - JULY 20: (NO UK SALES FOR 28 DAYS FROM CREATE DATE) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge make pretzels as they tour a traditional German market in the Central Square during an official visit to Poland and Germany on July 20, 2017 in Heidelberg, Germany. (Photo by Pool/Samir Hussein/WireImage)

HEIDELBERG, GERMANY - JULY 20:  (NO UK SALES FOR 28 DAYS FROM CREATE DATE) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge make pretzels as they tour a traditional German market in the Central Square during an official visit to Poland and Germany on July 20, 2017 in Heidelberg, Germany.  (Photo by Pool/Samir Hussein/WireImage)