ISLAMABAD, PAKISTAN - OCTOBER 15: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a special reception hosted by the British High Commissioner Thomas Drew, at the Pakistan National Monument, during day two of their royal tour of Pakistan on October 15, 2019 in Islamabad, Pakistan. (Photo by Chris Jackson/Getty Images)

CHITRAL DISTRICT, PAKISTAN - OCTOBER 16: Catherine, Duchess of Cambridge visits the village of Bumburet on October 16, 2019 in the Chitral District of Khyber-Pakhunkwa Province, Pakistan. They spoke with a an expert about how climate change is impacting glacial landscapes. The Cambridge's are engaging in a royal tour of Pakistan from 14 - 18 October 2019

CHITRAL, PAKISTAN - OCTOBER 16: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit a settlement of the Kalash people, to learn more about their culture and unique heritage, on October 16, 2019 in Chitral, Pakistan. Their Royal Highnesses The Duke and Duchess of Cambridge are on a visit of Pakistan between 14-18th October at the request of the Foreign and Commonwealth Office. (Photo by Samir Hussein - Pool/Getty Images)

LAHORE, PAKISTAN - OCTOBER 18: Catherine, Duchess of Cambridge receives a bracelet on a visit to the SOS Village on October 18, 2019 in Lahore, Pakistan. (Photo by Neil Hall - Pool/Getty Images)

ISLAMABAD, PAKISTAN - OCTOBER 18: Catherine, Duchess of Cambridge during a visit to an Army Canine Centre, where the UK provides support to a programme that trains dogs to identify explosive devices, during day five of their royal tour of Pakistan on October 18, 2019 in Islamabad, Pakistan. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - NOVEMBER 09: (L-R) Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Edward, Earl of Wessex attend the annual Royal British Legion Festival of Remembrance at the Royal Albert Hall on November 09, 2019 in London, England. (Photo by Chris Jackson/- WPA Pool/Getty Images)

LONDON, ENGLAND - NOVEMBER 12: Catherine, Duchess of Cambridge attends Shout's Crisis Volunteer Celebration Event at Troubadour White City on November 12, 2019 in London, England. Photo by Chris Jackson/Getty Images)

FRAMINGHAM EARL, NORFOLK - NOVEMBER 15: Catherine, Duchess of Cambridge opens The Nook Children Hospice on November 15, 2019 in Framingham Earl, Norfolk.The Duchess of Cambridge is Royal Patron of East Anglia's Children's Hospices. (Photo by Stephen Pond/Getty Images)

LONDON, ENGLAND - NOVEMBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Royal Variety Performance at the Palladium Theatre on November 18, 2019 in London, England. (Photo by John Phillips/Getty Images)

LONDON, ENGLAND - DECEMBER 03: Catherine, Duchess of Cambridge attends a reception for NATO leaders hosted by Queen Elizabeth II at Buckingham Palace on December 3, 2019 in London, England. Her Majesty Queen Elizabeth II hosted the reception at Buckingham Palace for NATO Leaders to mark 70 years of the NATO Alliance. (Photo by Yui Mok - WPA Pool/Getty Images)

GREAT MISSENDEN, ENGLAND - DECEMBER 04: Catherine, Duchess of Cambridge joins families and children who are supported by the charity Family Action at Peterley Manor Farm on December 04, 2019 in Great Missenden, England. This is to mark HRH new patronage of Family Action. (Photo by Chris Jackson/Getty Images)

L0NDON, ENGLAND - DECEMBER 11: Catherine, Duchess of Cambridge talks to guests at an evening reception for members of the Diplomatic Corps at Buckingham Palace on December 11, 2019 in London, England.(Photo by Victoria Jones - WPA Pool/Getty Images)

KING'S LYNN, ENGLAND - DECEMBER 25: Catherine, Duchess of Cambridge attends the Christmas Day Church service at Church of St Mary Magdalene on the Sandringham estate on December 25, 2019 in King's Lynn, United Kingdom. (Photo by Stephen Pond/Getty Images)