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Prince Louis, Duchess Kate — wearing Princess Diana's sapphire and diamond earrings — and Princess Charlotte watch the Trooping the Colour festivities from the balcony of Buckingham Palace in London as Queen Elizabeth II's Platinum Jubilee celebrations kick off on June 2, 2022.
RELATED: The best photos from Trooping the Colour through the decades
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Prince Charles and mother Queen Elizabeth II watch the Trooping the Colour festivities from the balcony of Buckingham Palace in London as the monarch's Platinum Jubilee celebrations kick off on June 2, 2022.
RELATED: See all the milestone moments from Queen Elizabeth II's 70-year reign
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Prince Louis, Princess Charlotte and Prince George have varying reactions as they watch Trooping the Colour festivities from the balcony at Buckingham Palace in London, kicking off Queen Elizabeth II's Platinum Jubilee celebrations on June 2, 2022.
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Prince Louis of Cambridge covers his ears on the Buckingham Palace balcony during the Trooping the Colour Royal Air Force fly-past on June 2, 2022.
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Prince George, Prince Louis and Princess Charlotte wave during the Trooping the Colour carriage procession — their first time participating — which kicked off Queen Elizabeth II's Platinum Jubilee in London on June 2, 2022.
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The most senior members of Britain's royal family — Camilla, Duchess of Cornwall, Prince Charles, Queen Elizabeth II, Prince Louis, Duchess Kate, Princess Charlotte, Prince George and Prince William — watch the Trooping the Colour festivities from the balcony of Buckingham Palace in London as the monarch's Platinum Jubilee celebrations kick off on June 2, 2022.
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Princess Charlotte and cousin Mia Tindall peek out a window of London's Buckingham Palace to watch the Trooping the Colour festivities as great-grandmother Queen Elizabeth II's Platinum Jubilee celebrations kick off on June 2, 2022.
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Prince Louis of Cambridge, Duchess Kate, Princess Charlotte of Cambridge and Prince George of Cambridge watch the Trooping the Colour festivities as Queen Elizabeth II's Platinum Jubilee celebrations kick off on June 2, 2022.
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Prince William and Princess Anne ride on horseback during Trooping the Colour, which kicked off Queen Elizabeth II's Platinum Jubilee in London on June 2, 2022.
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Prince George, Prince Louis and Princess Charlotte bow their heads as they pass the Colour — the troops — in the Trooping the Colour carriage procession as they arrive at Buckingham Palace amid the event, which kicked off Queen Elizabeth II's Platinum Jubilee in London on June 2, 2022.
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Queen Elizabeth II smiles from the balcony at Buckingham Palace after Trooping the Colour, which kicked off the monarch's Platinum Jubilee in London on June 2, 2022.
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Prince Charles and wife Camilla, Duchess of Cornwall join his mother, Queen Elizabeth II, on the balcony of Buckingham Palace in London to watch the Trooping the Colour festivities as the monarch's Platinum Jubilee celebrations kick off on June 2, 2022.
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Sophie, Countess of Wessex and husband Prince Edward, Earl of Wessex ride in the Trooping the Colour carriage procession, which kicked off Queen Elizabeth II's Platinum Jubilee, in London on June 2, 2022.
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Lady Louise Windsor and brother James, Viscount Severn ride in the Trooping the Colour carriage procession, which kicked off Queen Elizabeth II's Platinum Jubilee, in London on June 2, 2022.
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Prince George of Cambridge, Camilla, Duchess of Cornwall and Duchess Kate ride in the Trooping the Colour carriage procession, which kicked off Queen Elizabeth II's Platinum Jubilee in London on June 2, 2022.
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Prince Charles, Prince William and Princess Anne ride horses along The Mall toward Buckingham Palace during the queen's birthday parade, Trooping the Colour, which kicked off Queen Elizabeth II's Platinum Jubilee in London on June 2, 2022.
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Prince George, Prince Louis and Princess Charlotte ride in the Trooping the Colour carriage procession — their first time participating — which kicked off Queen Elizabeth II's Platinum Jubilee in London on June 2, 2022.
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Prince George, Prince Louis and Princess Charlotte ride in the Trooping the Colour carriage procession — their first time participating — which kicked off Queen Elizabeth II's Platinum Jubilee in London on June 2, 2022.
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Queen Elizabeth II and first cousin Prince Edward, Duke of Kent are seen on the balcony at Buckingham Palace after Trooping the Colour, which kicked off the monarch's Platinum Jubilee in London on June 2, 2022.
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Prince Richard, Duke of Gloucester and wife Birgitte, Duchess of Gloucester ride opposite Sir Timothy Laurence, Princess Anne's husband, in the Trooping the Colour carriage procession, which kicked off Queen Elizabeth II's Platinum Jubilee in London on June 2, 2022.
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Prince George, Prince Louis and Princess Charlotte ride in the Trooping the Colour carriage procession — their first time participating — which kicked off Queen Elizabeth II's Platinum Jubilee in London on June 2, 2022. Louis wore a sailor suit very similar to one his father, Prince William, wore 37 years earlier when he attended Trooping the Colour as a toddler.
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Members of the public fill The Mall ahead of a fly-past over Buckingham Palace during the queen's birthday parade, Trooping the Colour, which kicked off Queen Elizabeth II's Platinum Jubilee in London on June 2, 2022.