Which actress did Diana, Princess of Wales meet at her first public appearance with Prince Charles?

Diana, Princess of Wales (born Diana Frances Spencer; 1 July 1961 – 31 August 1997) was a member of the British royal family. She was the first wife of Charles, Prince of Wales, and the mother of Prince William and Prince Harry. Diana's activism and glamour made her an international icon and earned her enduring popularity as well as unprecedented public scrutiny, exacerbated by her tumultuous private life.

Charles and Diana's engagement became official on 24 February 1981. Diana selected a large engagement ring that consisted of 14 solitaire diamonds surrounding a 12-carat oval blue Ceylon sapphire set in 18-carat white gold, which was similar to her mother's engagement ring. The ring was made by the Crown jewellers Garrard.

Diana made her first public appearance with Prince Charles in a charity ball in March 1981 at Goldsmiths' Hall, where she met Grace Kelly, who was the Princess of Monaco.

Grace Patricia Kelly (November 12, 1929 – September 14, 1982) was an American film actress who, after starring in several significant films in the early- to mid-1950s. Kelly retired from acting at the age of 26 to marry Prince Rainier III in April 1956, in doing so she became the Princess of Monaco.