All the best moments of Prince William and Kate's kids at the coronation

The siblings arrived at Westminster Abbey for their grandfather's coronation.

Prince William and Kate's three children attended the coronation service for King Charles III and Queen Camilla Saturday.

Prince George, the second in line to the British throne, held a special role in the coronation, the first in the United Kingdom in 70 years. The eldest son of the Prince and Princess of Wales was a Page of Honor, processing behind Charles and holding his ceremonial robes as they entered Westminster Abbey.

For the occasion, George wore a bright scarlet tunic detailed with gold lace trim and blue velvet cuffs, along with white gloves, wool trousers and boots.

George, who is 9, was the youngest of the Pages of Honor. The group also included Queen Camilla's grandsons Master Gus Lopes, Master Louis Lopes and Master Freddy Parker Bowles, and her great-nephew Master Arthur Elliot.

Princess Charlotte, 8, and Prince Louis, 5, traveled separately to Westminster Abbey, riding in the same car with their mother.

Kate and Charlotte both wore floral headpieces with ornamental silver braids for the coronation.

Charlotte and Louis also walked behind their parents into the abbey and sat between them for the service.

After the coronation service ended, George reunited with the rest of his family and joined his siblings and parents in a black and gold carriage for the Coronation Procession back to Buckingham Palace.

via GIPHY

The royal children then followed the king and queen as they made a traditional Buckingham Palace balcony appearance. As Charles and Camilla waved at the crowds, Prince Louis brought a moment of light-hearted fun to the pomp and circumstance by playing an imaginary piano.