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FRENCH ALPS, FRANCE - MARCH 3: (NEWS EDITORIAL USE ONLY. NO COMMERCIAL USE. NO MERCHANDISING) Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, with their children, Princess Charlotte and Prince George, enjoy a short private skiing break on March 3, 2016 in the French Alps, France. (Photo by John Stillwell - WPA Pool/Getty Images) (TERMS OF RELEASE - News editorial use only - it being acknowledged that news editorial use includes newspapers, newspaper supplements, editorial websites, books, broadcast news media and magazines, but not (by way of example) calendars or posters.)

FRENCH ALPS, FRANCE - MARCH 3: (NEWS EDITORIAL USE ONLY. NO COMMERCIAL USE. NO MERCHANDISING) Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, with their children, Princess Charlotte and Prince George, enjoy a short private skiing break on March 3, 2016 in the French Alps, France. (Photo by John Stillwell - WPA Pool/Getty Images) (TERMS OF RELEASE - News editorial use only - it being acknowledged that news editorial use includes newspapers, newspaper supplements, editorial websites, books, broadcast news media and magazines, but not (by way of example) calendars or posters.)
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VICTORIA, BC - SEPTEMBER 24: (L-R) Prince William, Duke of Cambridge, Prince George of Cambridge, Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge arrive at 443 Maritime Helicopter Squadron on September 24, 2016 in Victoria, Canada. (Photo by Andrew Chin/Getty Images)

VICTORIA, BC - SEPTEMBER 24: (L-R) Prince William, Duke of Cambridge, Prince George of Cambridge, Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge arrive at 443 Maritime Helicopter Squadron on September 24, 2016 in Victoria, Canada. (Photo by Andrew Chin/Getty Images)
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BUCKLEBURY, BERKSHIRE - DECEMBER 25: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, Prince George of Cambridge and Princess Charlotte of Cambridge arrive to attend the service at St Mark's Church on Christmas Day on December 25, 2016 in Bucklebury, Berkshire. (Photo by Andrew Matthews - WPA Pool/Getty Images)

BUCKLEBURY, BERKSHIRE - DECEMBER 25: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, Prince George of Cambridge and Princess Charlotte of Cambridge arrive to attend the service at St Mark's Church on Christmas Day on December 25, 2016 in Bucklebury, Berkshire. (Photo by Andrew Matthews - WPA Pool/Getty Images)
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VICTORIA, BC - SEPTEMBER 29: Catherine, Duchess of Cambridge, Princess Charlotte of Cambridge, Prince George of Cambridge and Prince William, Duke of Cambridge arrive for a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)

VICTORIA, BC - SEPTEMBER 29: Catherine, Duchess of Cambridge, Princess Charlotte of Cambridge, Prince George of Cambridge and Prince William, Duke of Cambridge arrive for a children's party for Military families during the Royal Tour of Canada on September 29, 2016 in Victoria, Canada. Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson - Pool/Getty Images)
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