WINDSOR, UNITED KINGDOM JULY 26: Diana, The Princess of Wales, and Queen Elizabeth II watching Polo, at Smiths Lawn, Windsor, on July 26, 1987 in Windsor, United Kingdom . (Photo by Julian Parker/UK Press via Getty Images)
WINDSOR, UNITED KINGDOM JULY 26: Diana, The Princess of Wales, and Queen Elizabeth II watching Polo, at Smiths Lawn, Windsor, on July 26, 1987 in Windsor, United Kingdom . (Photo by Julian Parker/UK Press via Getty Images)