Kate Middleton's Trooping the Colour outfit had a deeper meaning. All about why the Princess of Wales wore aqua to King Charles' birthday parade on June 14.

After arriving at Buckingham Palace by car, Kate and the children, Prince George, 11, Princess Charlotte and Prince Louis, 7, traveled in a traditional horse-drawn carriage down The Mall. Charlotte sat beside her mother, while her brothers faced backward across from them.

Senior working royals including Prince William, Kate Middleton, Princess Anne, Prince Edward and Queen Camilla will reportedly take part in the king's birthday parade.

While the cost of this year’s event has not been confirmed, it was revealed by the Ministry of Defence in 2021 that it cost them £59,662.70 that year for Trooping the Colour - a fact that was revealed after a freedom of information request.

While celebrating the monarch’s birthday with the annual Trooping the Colour in London on Saturday, Prince Louis, 7, gave an enthusiastic greeting to the crowd.

Prince William, Princess Kate Middleton and their children George, Charlotte and Louis are set to join King Charles and Queen Camilla this weekend for the 2025 Trooping the Colour celebrations (a.k.a. the King’s Birthday Parade). The annual event marks King Charles III’s birthday with a parade and procession through the streets of London.

"Set with diamonds, sapphires, rubies and emeralds, the bejewelled piece features the cypher of her father, King George VI," Zack Stone, a fine jewelry expert from U.K. retailer Steven Stone, shared with WWD.