It's the OFFICIAL 90th birthday of Queen Elizabeth II

At 13 months old, Charlotte is nearly the same age that her "Gan-Gan" the Queen was when she first appeared on the same balcony as a baby 89 years ago, in June 1927.

Princess Charlotte has made her first public appearance on the balcony at Buckingham Palace.

Image: This official photograph released by Buckingham Palace to mark her 90th birthday shows Britain's Queen Elizabeth with her husband, Prince Philip, and was taken at Windsor Castle, in Windsor, Britain just after Easter 2016.

There will be a carnival-style parade watched by the monarch, the Duke of Edinburgh, the Duke of Cambridge and Prince Harry.

Wearing a pink dress with a matching pink bow and shoes, Charlotte gave the people her biggest smile and a wave.

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In an impromptu speech, Her Majesty said: "How I shall feel if you still are singing "Happy Birthday" in December remains to be seen". But celebrating two birthdays is part of a tradition which dates back over 250 years.

The royal Guards which were also joined by other soldiers including pensioners were there to celebrate the Queen's birthday with the Trooping the Colour - a traditional ceremony within the military.

The splendid parade featured more than 1,500 soldiers and officers, also included a fly-by of historic World War II aircraft and modern fighter planes, ABC reports.

The event, which was organised by the Queen's grandson Peter Phillips, recognised the Queen's patronage of more than 600 organisations around the United Kingdom and Commonwealth.

The Queen's real birthday is on April 21, but official celebrations always take place on June 10, and often for a whole weekend.

  • Jack Mann