Princess Charlotte comforts younger brother Prince Louis in sweet moment at King Charles’ Coronation

The siblings arrived at King Charles’ Coronation ceremony in a car with mother Princess Kate.

Footage from outside Westminster Abbey showed cheeky Prince Louis waving from the car.

The trio also entered Westminster Abbey alongside father Prince William.

Eldest brother Prince George was slightly ahead of the rest of the Waleses as he helped carry the Robe of State as his grandfather marched into Westminster Abbey.

Princess Charlotte is third in line to the throne.

She turned eight on Tuesday, just four days before the historic ceremony.

Prince Louis, who celebrated his fifth birthday at the end of April, is fourth in the line of succession.

He was later seen making some funny facial expressions while sat next to his mother.

People took to social media to joke about Louis' cheeky actions.

One said: "I’m only here for Prince Louis facial expressions."

Another added: "I wish the camera would show more of Prince Louis, his facial expressions make this family."

Prince Louis had a memorable appearance at Queen Elizabeth II's Platinum Jubilee celebrations last year, including when he blew a raspberry at his mother.

Princess Charlotte arrived at the Coronation wearing a scaled-down version of Princess Kate's gown.

Her outfit was accompanied with a headpiece which matched the one worn by her mother.

Prince George played a significant role in Charles Coronation as a Page of Honour.

The future King carried a corner of his grandfather's trailing robes as the royal party walked into Westminster Abbey.

George was joined by Nicholas Barclay and Lord Oliver Cholmondeley, both 13, and Ralph Tollemache, 12 - all the sons of notable, royal-linked families.

The King's Pages of Honour donned traditional uniforms, consisting of scarlet tunics decorated with gold lace trim and blue velvet cuffs.

The outfits were first seen at the Coronation of King Edward VII more than a century ago in 1902.