Queen Elizabeth and Prince Philip celebrate platinum anniversary

The engagement of the Queen (then Princess Elizabeth) and the Duke of Edinburgh (then Philip Mountbatten) July 1947.

Princess Elizabeth, later Queen Elizabeth II with her husband Phillip, Duke of Edinburgh, after their marriage on Nov. 20, 1947.

Princess Elizabeth and Philip, Duke of Edinburgh, pose with King George VI and Queen Elizabeth and other members of the royal family at Buckingham Palace, after their wedding, November 20, 1947. The two pageboys are Elizabeth's cousins, Prince William of Gloucester and Prince Michael of Kent, and the eight bridesmaids are Princess Margaret, Princess Alexandra of Kent, Lady Caroline Montagu-Douglas-Scott, Lady Mary Cambridge, Lady Elizabeth Lambart, Pamela Mountbatten, Margaret Elphinstone and Diana Bowes-Lyon. 

Princess Elizabeth and the Duke of Edinburgh hold their first child Prince Charles, aged 6 months in 1949. 

Britain's Queen Elizabeth II, then Princess Elizabeth, stands with her husband Prince Philip, the Duke of Edinburgh, and their children Prince Charles and Princess Anne at Clarence House, the royal couple's London residence, in August 1951.

The Coronation of Queen Elizabeth II was held on June 2, 1953 in Westminster Abbey, London, more than a year after Elizabeth, then aged 26, ascended the thrones of the United Kingdom upon the death of her father, King George VI, on February 6, 1952. 

Queen Elizabeth II and Prince Phillip in an undated photo.

Baby Prince Andrew perches on Prince Philip's lap during a picnic on the grounds of Balmoral Castle. Also pictured are Queen Elizabeth, Prince Charles, and Princess Anne.

Britain's Prince Philip and his wife Queen Elizabeth II arrive at Royal Ascot race in England on June 19, 1962. 

Queen Elizabeth II holds her 12 week old son, Prince Edward, as she stands with her husband Prince Phillip on the balcony of Buckingham Palace on June 13, 1964. 

Queen Elizabeth II with Charles, Prince of Wales, Prince Philip, Duke of Edinburgh, and Anne, Princess Royal during a visit to the Isles of Sicily in 1967. 

The Royal family gets together at Frogmore, Windsor, England in April 1968, to celebrate the 42nd birthday of England's Queen Elizabeth II, the Duke of Edinburgh, her husband, Princess Ann, Price Edward, The Queen , Prince Andrew and Prince Charles of Wales. 

The royal family at Buckingham Palace, London, 1972. Left to right: Princess Anne, Prince Andrew, Prince Philip, Queen Elizabeth, Prince Edward and Prince Charles.

Queen Elizabeth II poses April 15, 1976, on the grounds of Windsor Castle with Prince Phillip and their youngest son, Prince Edward, 12, for a photo to commemorate the Queen's 50th birthday which falls on April 21. 

Britain's Queen Elizabeth II reads from her statement during the State Opening of Parliament in London on Nov. 12, 1986. 

President Robert Mugabe of Zimbabwe is greeted by Queen Elizabeth ll and Prince Phillip the Duke of Edinburgh at Buckingham Palace, London during his State Visit to England in May of 1994. 

Queen Elizabeth ll and Prince Philip, Duke of Edinburgh are joined by their children, Prince Charles, Prince of Wales (L), Prince Andrew, Duke of York, Princess Anne, the Princess Royal and Prince Edward, Earl of Wessex at a dinner hosted by the Prince of Wales and the Duchess of Cornwall at Clarence House to mark the Diamond Wedding Anniversary of the Queen and Duke on November 18, 2007 in London, England.

(L-R) Prince Andrew, Duke of York, Sophie, Countess of Wessex, Camilla, Duchess of Cornwall, Prince Charles, Prince of Wales, Prince Edward, Earl of Wessex, Queen Elizabeth II, Princess Anne, Princess Royal, Prince Philip, Duke of Edinburgh, Lady Louise Windsor, Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Princess Eugenie and Prince Harry stand on the balcony of Buckingham Palace during the Trooping the Color ceremony on June 16, 2012 in London, England.

Britain's Queen Elizabeth II (L) and her husband Prince Philip, Duke of Edinburgh arrive to attend Ladies Day at Royal Ascot race meeting, in Ascot, England on June 21, 2012.

Queen Elizabeth II, and Prince Phillip, Duke of Edinburgh walk through the Norman Porch of the Palace of Westminster after the State Opening of Parliament on May 8, 2013 in London. 

Britain's Queen Elizabeth II and Prince Philip, the Duke of Edinburgh wave to well-wishers during her 90th birthday celebrations in Windsor, England on April 21, 2016. Thousands of people turned out to wish Britain's longest serving monarch a happy birthday.

(L-R) Princess Anne, Princess Royal, Camilla, Duchess of Cornwall, Prince Charles, Prince of Wales, Catherine, Duchess of Cambridge, Princess Charlotte, Prince George, Prince William, Duke of Cambridge, Prince Harry, Queen Elizabeth II and Prince Philip, Duke of Edinburgh stand on the balcony during the Trooping the Color, this year marking the Queen's 90th birthday at The Mall on June 11, 2016 in London, England.