Louis, 5, joined his parents and siblings, Prince George, 9, and Princess Charlotte, 8, and other royal family members of the balcony of Buckingham Palace following the coronation service.
The youngster went viral on social media with his funny antics as he watched a military flypast zoom overhead.
Earlier, inside Westminster Abbey, Louis was seen alternatively yawning and looking around inquisitively as the pomp and circumstance of the coronation service played out before him.
Britain's Prince Louis yawns as he arrives at Westminster Abbey for King Charles' coronation ceremony, in London, May 6, 2023.
Dylan Martinez/Reuters
The Royals attend the Coronation of King Charles III and Queen Camilla at Westminster Abbey on May 6, 2023 in London.
Victoria Jones/Wpa Pool/Getty Images
The Royals attend the Coronation of King Charles III and Queen Camilla at Westminster Abbey on May 6, 2023 in London.
Yui Mok/Wpa Pool/Getty Images
Princess Charlotte and Prince Louis arrive at Westminster Abbey, central London, ahead of the coronation ceremony of King Charles III and Queen Camilla on May 6, 2023.
Andrew Milligan/Pool via Reuters
Following the service, Louis joined his family inside a carriage in the procession back to Buckingham Palace.
Sitting by a window, Louis was seen waving and looking out at the crowds gathered to watch his family's historic day.
Prince Louis and Prince George travel towards Buckingham Palace following Britain's King Charles and Queen Camilla's coronation ceremony in London, May 6, 2023.
Piroschka Van De Wouw/POOL via Reuters
Prince Louis travels towards Buckingham Palace following Britain's King Charles and Queen Camilla's coronation ceremony in London, May 6, 2023.
Sebastien Bozon/POOL/AFP via Getty Images
Catherine, Princess of Wales, Prince Louis of Wales and Page of Honour Prince George depart the Coronation service of King Charles III and Queen Camilla, May 06, 2023 in London.
Dan Kitwood/Getty Images
May 06, 2023, 11:20 AM EDT
See Charles today compared to Queen Elizabeth in 1953
Charles' coronation Saturday immediately drew comparisons to the last coronation that took place 70 years ago, that of his mother, Queen Elizabeth II.
After a coronation service at Westminster Abbey that closely followed his mom's ceremony -- with notable differences included -- Charles appeared on the balcony of Buckingham Palace, where his mom waved to her subjects so many times during her 70-year reign.
In one photo, Charles is seen waving his right hand exactly as the queen did on June 2, 1953.
Split photo show Queen Elizabeth II and the Duke of Edinburgh wave at the crowds from the balcony at Buckingham Palace after Elizabeth's coronation, June 2, 1953, on top, and King Charles III and Queen Camilla can be seen on the Buckingham Palace balcony ahead of the flypast during the Coronation of King Charles III and Queen Camilla, May 06, 2023 in London.
In the photo, Camilla stands to Charles' left, just as Charles' father, Prince Philip, stood next to the queen at her coronation.
May 06, 2023, 11:19 AM EDT
Royals take official coronation photos
Following the end of the day’s public ceremonial events, Charles and Camilla and members of the royal family are now taking official photos in the Throne Room and the Green Drawing Room of Buckingham Palace.
Britain's King Charles and Queen Camilla stand on the Buckingham Palace balcony following their coronation ceremony in London, Britain May 6, 2023.
Hannah Mckay/Reuters
The photographs are being taken by Hugo Burnand, a British photographer who was the official photographer for William and Kate’s 2011 wedding and was commissioned by Charles to take his official 70th birthday portrait.
May 06, 2023, 9:50 AM EDT
Prince Harry absent from Buckingham Palace balcony appearance
Prince Harry did not join his family for the traditional balcony appearance at Buckingham Palace following the coronation service.
The royals appear on the Buckingham Palace balcony during the Coronation of King Charles III and Queen Camilla on May 6, 2023 in London.
As a non-working royal, Harry also did not join his family for the carriage procession from Westminster Abbey to Buckingham Palace.
Britain's Prince Harry leaves Westminster Abbey following Britain's King Charles' coronation ceremony, in London, May 6, 2023.
Henry Nicholls/Reuters
Harry attended the coronation alone, with his wife Meghan and their two children, Archie and Lilibet, staying home in California.
Sources told ABC News royal contributor Omid Scobie that Harry will be heading back to the U.S. soon after attending his father's coronation.
Britain's Prince Harry, Duke of Sussex, leaves Westminster Abbey following the coronation ceremony of Britain's King Charles and Queen Camilla, in London, May 6, 2023.
Toby Melville/POOL/Reuters
The date of the coronation coincides with Archie's birthday, who turns 4 Saturday.
