Prince Charles has sparked a huge debate online after he called the Queen "mummy" during the Jubilee concert over the weekend. The 73-year-old addressed the monarch during a moving speech in front of spectators watching the BBC's Party at the Palace on Saturday night.He joined the Cambridges and the Tindalls as they sang along to a star-studded line-up which included performances from Sir Elton John, Diana Ross and Sir Rod Stewart.Closing off the entertainment, he marked his mother's 70 years of reign and said: “Your Majesty, Mummy.