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Princess Royal before the RBS 6 Nations match at BT Murrayfield Stadium, Edinburgh. (Photo by Jane Barlow/PA Images via Getty Images)

Princess Royal before the RBS 6 Nations match at BT Murrayfield Stadium, Edinburgh. (Photo by Jane Barlow/PA Images via Getty Images)

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Anne, Princess Royal leaving the stadium after the RBS 6 Nations match at BT Murrayfield Stadium, Edinburgh. (Photo by Owen Humphreys/PA Images via Getty Images)

Anne, Princess Royal leaving the stadium after the RBS 6 Nations match at BT Murrayfield Stadium, Edinburgh. (Photo by Owen Humphreys/PA Images via Getty Images)

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Edinburgh , United Kingdom - 4 February 2017; Greig Laidlaw of Scotland is presented with the Centenary Quaich by HRH Princess Anne following the RBS Six Nations Rugby Championship match between Scotland and Ireland at BT Murrayfield Stadium in Edinburgh, Scotland. (Photo By Ramsey Cardy/Sportsfile via Getty Images)

Edinburgh , United Kingdom - 4 February 2017; Greig Laidlaw of Scotland is presented with the Centenary Quaich by HRH Princess Anne following the RBS Six Nations Rugby Championship match between Scotland and Ireland at BT Murrayfield Stadium in Edinburgh, Scotland. (Photo By Ramsey Cardy/Sportsfile via Getty Images)