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Britain's Prince Edward, Earl of Wessex (2R) ans his wife Britain's Sophie, Countess of Wessex arrive at Westminster Abbey in central London on November 24, 2016, to attend a Service of Thanksgiving to celebrate 60 years of The Duke of Edinburgh's Award. / AFP / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

Britain's Prince Edward, Earl of Wessex (2R) ans his wife Britain's Sophie, Countess of Wessex arrive at Westminster Abbey in central London on November 24, 2016, to attend a Service of Thanksgiving to celebrate 60 years of The Duke of Edinburgh's Award.  / AFP / Justin TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

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LONDON, ENGLAND - NOVEMBER 24: Sophie, Countess of Wessex attends a Service of Thanksgiving to celebrate 60 years of The Duke of Edinburgh's Award at Westminster Abbey on November 24, 2016 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

LONDON, ENGLAND - NOVEMBER 24:  Sophie, Countess of Wessex attends a Service of Thanksgiving to celebrate 60 years of The Duke of Edinburgh's Award at Westminster Abbey on November 24, 2016 in London, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)

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LONDON, ENGLAND - NOVEMBER 24: Sophie, Countess of Wessex and Prince Edward, Earl of Wessex attend a Service of Thanksgiving to celebrate 60 years of The Duke of Edinburgh's Award at Westminster Abbey on November 24, 2016 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

LONDON, ENGLAND - NOVEMBER 24:  Sophie, Countess of Wessex and Prince Edward, Earl of Wessex attend a Service of Thanksgiving to celebrate 60 years of The Duke of Edinburgh's Award at Westminster Abbey on November 24, 2016 in London, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)

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Britain's Sophie, Countess of Wessex, arrives at Westminster Abbey in central London on November 24, 2016, to attend a Service of Thanksgiving to celebrate 60 years of The Duke of Edinburgh's Award. / AFP / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

Britain's Sophie, Countess of Wessex, arrives at Westminster Abbey in central London on November 24, 2016, to attend a Service of Thanksgiving to celebrate 60 years of The Duke of Edinburgh's Award.  / AFP / Justin TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

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LONDON, ENGLAND - NOVEMBER 24: Sophie, Countess of Wessex attends a Service of Thanksgiving to celebrate 60 years of The Duke of Edinburgh's Award at Westminster Abbey on November 24, 2016 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

LONDON, ENGLAND - NOVEMBER 24:  Sophie, Countess of Wessex attends a Service of Thanksgiving to celebrate 60 years of The Duke of Edinburgh's Award at Westminster Abbey on November 24, 2016 in London, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)