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LONDON, ENGLAND - OCTOBER 20: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the launch of the Hold Still campaign at Waterloo Station on October 20, 2020 in London, England. (Photo by Jeremy Selwyn - WPA Pool/Getty Images)

LONDON, ENGLAND - OCTOBER 20: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the launch of the Hold Still campaign at Waterloo Station on October 20, 2020 in London, England. (Photo by Jeremy Selwyn - WPA Pool/Getty Images)

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LONDON, ENGLAND - OCTOBER 20: Catherine, Duchess of Cambridge arrives for the launch of the Hold Still campaign at Waterloo Station on October 20, 2020 in London, England. (Photo by Jeremy Selwyn - WPA Pool/Getty Images)

LONDON, ENGLAND - OCTOBER 20: Catherine, Duchess of Cambridge arrives for the launch of the Hold Still campaign at Waterloo Station on October 20, 2020 in London, England. (Photo by Jeremy Selwyn - WPA Pool/Getty Images)

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LONDON, UNITED KINGDOM - DECEMBER 06: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge speak to transport workers at London Euston Station on December 06, 2020 in London, United Kingdom. The Duke and Duchess of Cambridge will embark on a three day tour aboard the Royal train to thank frontline staff and community workers in the UK. (Photo by Chris Jackson/Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 06: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge speak to transport workers at London Euston Station on December 06, 2020 in London, United Kingdom.  The Duke and Duchess of Cambridge will embark on a three day tour aboard the Royal train to thank frontline staff and community workers in the UK. (Photo by Chris Jackson/Getty Images)

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CARDIFF, UNITED KINGDOM - DECEMBER 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge visits Cardiff Castle on December 8, 2020 in Cardiff, Wales. The Duke and Duchess of Cambridge are undertaking a short tour of the UK, using the Royal train, ahead of the Christmas holidays to pay tribute to the inspiring work of individuals, organisations and initiatives across the country that have gone above and beyond to support their local communities during the coronavirus pandemic. (Photo by Pool/Max Mumby/Getty Images)

CARDIFF, UNITED KINGDOM - DECEMBER 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge visits Cardiff Castle on December 8, 2020 in Cardiff, Wales. The Duke and Duchess of Cambridge are undertaking a short tour of the UK, using the Royal train, ahead of the Christmas holidays to pay tribute to the inspiring work of individuals, organisations and initiatives across the country that have gone above and beyond to support their local communities during the coronavirus pandemic. (Photo by Pool/Max Mumby/Getty Images)

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CARDIFF, UNITED KINGDOM - DECEMBER 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge visits Cardiff Castle on December 8, 2020 in Cardiff, Wales. The Duke and Duchess of Cambridge are undertaking a short tour of the UK, using the Royal train, ahead of the Christmas holidays to pay tribute to the inspiring work of individuals, organisations and initiatives across the country that have gone above and beyond to support their local communities during the coronavirus pandemic. (Photo by Pool/Max Mumby/Getty Images)

CARDIFF, UNITED KINGDOM - DECEMBER 08: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge visits Cardiff Castle on December 8, 2020 in Cardiff, Wales. The Duke and Duchess of Cambridge are undertaking a short tour of the UK, using the Royal train, ahead of the Christmas holidays to pay tribute to the inspiring work of individuals, organisations and initiatives across the country that have gone above and beyond to support their local communities during the coronavirus pandemic. (Photo by Pool/Max Mumby/Getty Images)