Princess Anne, the Princess Royal, 73, was a glittering vision at the Buckingham Palace Garden Party as she wore a diamond brooch gifted to her by her late mother, Queen Elizabeth II, on her first wedding day in 1973. Princess Anne, the Princess Royal, 73, was a glittering vision at the Buckingham Palace Garden Party as she wore a diamond brooch gifted to her by her late mother, Queen Elizabeth II, on her first wedding day in 1973.