The UK's Queen Elizabeth celebrated her 70th wedding anniversary on Monday with her husband Prince Philip. She was 21 when she walked down the aisle on November 20, 1947. She is the first British monarch to celebrate a platinum wedding anniversary. She is also the UK's longest reigning monarch. The couple spent the day at a small private party at their home - Windsor Castle. They marked the occasion with a set of official portraits. Britain's post office also celebrated the anniversary with a set of commemorative postage stamps.
The royal couple met as teenagers during World War II. Prince Philip was the son of a Greek prince. He gave up his title to marry the then Princess Elizabeth. Before his wedding, he told his future mother-in-law that he had, "fallen in love completely" with her daughter. He said: "My job first, second and last, is never to let the Queen down." The Queen has always relied on her husband. She described him as her "rock". A former BBC journalist explained that humor helped their marriage. She said: "A big part of what has kept them going…is the fact they can share a joke together."