Prince Charles and Princess Diana set a royal tradition after sharing a kiss on the balcony of Buckingham Palace after their wedding but were outshone by William and Kate, who decided to please the crowd with two kisses on their special day. The weddings were discussed during the Royally Obsessed podcast by royal commentators Rachel Bowie and Roberta Fiorito.

       Roberta Fiorito said of Charles and Diana's kiss: "They started the balcony kiss tradition – which was born out of a mistake."

       "I think they forgot to kiss during the wedding."

       She added: "I love hearing people talk about it, saying yes this is the modern monarchy and the contrast between how we look at Kate and William as the modern monarchy. You keep moving the needle a little bit forward."

       "Well they kissed twice so they really did one-up their parents in comparison."

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       The Prince of Wales married 20-year-old Diana Spencer on July 29, 1981 at St Paul's Cathedral

       Branded "the wedding of the century", it was viewed by an estimated 750million people across the globe, with millions across the UK participating in street parties and events.

       The couple had become engaged after a 6-month courtship and had only been on 13 dates before announcing that they intended to wed.

       The 31-year-old Prince had known Diana for several years after he had previously romanced her older sister, Lady Sarah.

       During the wedding service, Diana accidentally changed the order of Charles's names during her vows, saying "Philip Charles Arthur George".

       They also decided to omit the word 'obey', which received widespread attention at the time.

       Following the service, the couple returned to Buckingham Palace for a balcony appearance and their wedding reception.

       In front of an estimated 2million people down The Mall, the couple leant in for a kiss, a gesture that has since been repeated in all royal weddings.

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       Prince William and Kate also decided not to kiss during their wedding service at Westminster Abbey, but decided to treat the crowd to two kisses when appearing on the balcony with other members of the Royal Family.

       The couple were married on April 29, 2011 after becoming engaged the previous October.

       In contrast to Charles and Diana's whirlwind romance, the Duke and Duchess of Cambridge had been in a steady relationship for over eight years after becoming friends at university.

       They recently celebrated their tenth wedding anniversary, marking the occasion with a sweet video showing them with their three children; Prince George, Princess Charlotte and Prince Louis.