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Princess Anne with RFU President Peter Baines (left) during the RBS Six Nations match at Twickenham Stadium, London. (Photo by Andrew Matthews/PA Images via Getty Images)

Princess Anne with RFU President Peter Baines (left) during the RBS Six Nations match at Twickenham Stadium, London. (Photo by Andrew Matthews/PA Images via Getty Images)

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Prince Harry (left) and Princess Anne in the stands during the RBS Six Nations match at Twickenham Stadium, London. (Photo by Andrew Matthews/PA Images via Getty Images)

Prince Harry (left) and Princess Anne in the stands during the RBS Six Nations match at Twickenham Stadium, London. (Photo by Andrew Matthews/PA Images via Getty Images)

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Prince Harry (second left), Princess Anne (right) and Secretary of State for Defence Sir Michael Fallon (left) during the national anthem during the RBS Six Nations match at Twickenham Stadium, London. (Photo by Andrew Matthews/PA Images via Getty Images)

Prince Harry (second left), Princess Anne (right) and Secretary of State for Defence Sir Michael Fallon (left) during the national anthem during the RBS Six Nations match at Twickenham Stadium, London. (Photo by Andrew Matthews/PA Images via Getty Images)

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Prince Harry (left) and Princess Anne (right) in the stands during the RBS Six Nations match at Twickenham Stadium, London. (Photo by Andrew Matthews/PA Images via Getty Images)

Prince Harry (left) and Princess Anne (right) in the stands during the RBS Six Nations match at Twickenham Stadium, London. (Photo by Andrew Matthews/PA Images via Getty Images)