Prince Charles and his bride Diana, Princess of Wales, march down the aisle of St. Paul's Cathedral at the end of their wedding ceremony on July 29, 1981 in London. (AP Photo)

Prince Charles and his bride Diana, Princess of Wales, march down the aisle of St. Paul's Cathedral at the end of their wedding ceremony on July 29, 1981 in London. The bride's maids and the groom's brothers Prince Andrew, top left, and Prince Edwards, top right, march behind them. (AP Photo)

Prince Charles and Lady Diana Spencer are shown on their wedding day at St. Paul's Cathedral in London on July 29, 1981. (AP Photo)

Diana, Princess of Wales, is shown on her wedding day in St. Paul's Cathedral in London on July 29, 1981. (AP Photo)

Prince Charles and his new bride Diana, Princess of Wales, pose for a family portrait with other members of the royal family, in the Throne Room of Buckingham Palace, on their wedding day July 29, 1981. (AP Photo)

Lady Diana Spencer arrives with her father, the Earl Spencer, at St. Paul's Cathedral in London on July 29, 1981, for her wedding ceremony. (AP Photo)

Prince Charles and the Princess of Wales, wearing a coral silk dress and matching hat, ride in an open carriage to Waterloo Station, July 29, 1981, to start their honeymoon at Broadlands. (AP Photo/BIPNA, Pool)

The carriage carrying the Prince and Princess of Wales passes along Trafalgar Square on its way from St. Paul's Cathedral to Buckingham Palace after the royal wedding in London on July 29, 1981. (AP Photo)

Prince Charles and Lady Diana Spencer are shown at their wedding at St. Paul's Cathedral on July 29, 1981, in London. (AP Photo)

Prince Charles and Lady Diana Spencer are shown at their wedding ceremony held at St. Paul's Cathedral in London on July 29, 1981. (AP Photo)

A shy Diana, Princess of Wales, and Prince Charles on the balcony of Buckingham Palace after their wedding at St. Paul's Cathedral, July 29, 1981, in London. (AP Photo)

The formal wedding portrait of Prince Charles and the Princess of Wales, taken at Buckingham Palace July 29, 1981, after their marriage at St. Paul's Cathedral, London. (AP Photo)

Prince Charles and his bride Diana, the new Princess of Wales, wearing a coral silk dress and matching hat, ride toward Waterloo Station in an open carriage on their way to their honeymoon at Broadlands, July 29, 1981. (AP Photo)

With a 25-foot (7.6 meter) sweeping train, The Princess of Wales, former Lady Diana Spencer, leaves St. Paul's Cathedral arm in arm with Prince Charles at the end of their wedding ceremony in London, July 29, 1981. (AP Photo)

Prince Charles and his bride Diana, Princess of Wales, pose in the Throne Room of Buckingham Palace for this picture made after their wedding at St. Paul's Cathedral today. Back row, left to right: Edward van Cutsem, Lord Nicholas Windsor, Sarah Jane Gaselee, Prince Edward, Prince Charles, The Princess of Wales, Prince Andrew and Lady Sarah Armstrong-Jones. Front row, left to right: Catherine Cameron, seated, India Hicks, standing, and Clementine Hambro, seated. (AP Photo, BIPNA, Pool)

With a 25-foot (7.6 meter) sweeping train, The Princess of Wales, former Lady Diana Spencer, leaves St. Paul's Cathedral arm in arm with Prince Charles at the end of their wedding ceremony in London, July 29, 1981. (AP Photo/Pool)

Britain's Prince Charles and his bride, the former Lady Diana Spencer, drive from St. Paul's Cathedral after their wedding ceremony in London, England, July 29, 1981. (AP Photo)

Prince Charles and Princess Diana on the balcony of Buckingham Palace in London on their wedding day on July 29, 1981. (AP Photo)

Prince Charles and Princess Diana on the balcony of Buckingham Palace in London on their wedding day on July 29, 1981. (AP Photo)

Princess Anne and Princess Margaret driving to the Royal wedding of Prince Charles and Lady Diana Spencer in London on July 29, 1981. (AP Photo)