Sovereign Elizabeth II, 96, made an unexpected appearance at the Platinum Jubilee Pageant

the final event of a four-day celebration marking her 70 years on the throne.

Prince Charles and wife Camilla, Duchess of Cornwall, plus Prince William and Kate Middleton and their sons Prince George, 8, and Prince Louis, 4, and daughter Princess Charlotte, 7.

Princess Charlotte and Prince George Greet Fans During Platinum Jubilee Visit to Cardiff Castle

Moments before, her family members and the spectators gathered outside the palace sang the British national anthem, "God Save the Queen."

Queen Elizabeth II makes a surprise appearance with her family on a Buckingham Palace balcony during the Platinum Jubilee Pageant, the final Platinum Jubilee event, on June 5.

Queen Elizabeth II and Charlotte give Her Majesty's signature wave.

Louis cheers at the Platinum Jubilee Pageant.

George looks perplexed at the Platinum Jubilee Pageant.

Louis kisses mom Kate at the Platinum Jubilee Pageant.

Queen Elizabeth II and other royals on a Buckingham Palace balcony to watch the Trooping the Colour parade