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KING'S LYNN, UNITED KINGDOM - DECEMBER 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge is greeted by Richard Jewson, The Lord-Lieutenant for Norfolk as she attends a special Cub Scout Pack meeting with Cubs from the Kings Lynn District to celebrate 100 years of Cubs on December 14, 2016 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)

KING'S LYNN, UNITED KINGDOM - DECEMBER 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge is greeted by Richard Jewson, The Lord-Lieutenant for Norfolk as she attends a special Cub Scout Pack meeting with Cubs from the Kings Lynn District to celebrate 100 years of Cubs on December 14, 2016 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)

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KING'S LYNN, UNITED KINGDOM - DECEMBER 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends a special Cub Scout Pack meeting with Cubs from the Kings Lynn District to celebrate 100 years of Cubs on December 14, 2016 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)

KING'S LYNN, UNITED KINGDOM - DECEMBER 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends a special Cub Scout Pack meeting with Cubs from the Kings Lynn District to celebrate 100 years of Cubs on December 14, 2016 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)

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KING'S LYNN, UNITED KINGDOM - DECEMBER 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends a special Cub Scout Pack meeting with Cubs from the Kings Lynn District to celebrate 100 years of Cubs on December 14, 2016 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)

KING'S LYNN, UNITED KINGDOM - DECEMBER 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends a special Cub Scout Pack meeting with Cubs from the Kings Lynn District to celebrate 100 years of Cubs on December 14, 2016 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)

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KING'S LYNN, UNITED KINGDOM - DECEMBER 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends a special Cub Scout Pack meeting with Cubs from the Kings Lynn District to celebrate 100 years of Cubs on December 14, 2016 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)

KING'S LYNN, UNITED KINGDOM - DECEMBER 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends a special Cub Scout Pack meeting with Cubs from the Kings Lynn District to celebrate 100 years of Cubs on December 14, 2016 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)

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KING'S LYNN, UNITED KINGDOM - DECEMBER 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends a special Cub Scout Pack meeting with Cubs from the Kings Lynn District to celebrate 100 years of Cubs on December 14, 2016 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)

KING'S LYNN, UNITED KINGDOM - DECEMBER 14: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends a special Cub Scout Pack meeting with Cubs from the Kings Lynn District to celebrate 100 years of Cubs on December 14, 2016 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)