Prince Louis isn't the only member of the British royal family that is popular on social media.
Following Queen Elizabeth's Platinum Jubilee, which ended on Sunday, his older sister, Princess Charlotte, went viral. The four-day celebrations commemorated the reigning monarch's 70 years on the throne.
The queen, 96, stood on the balcony of Buckingham Palace with Prince Charles, Camilla, Duchess of Cornwall, Prince William, Kate Middleton, and their children Prince George, Charlotte, and Louis during the Platinum Jubilee finale.
George placed his hand on the balcony ledge as the national song "God Save the Queen" played. Charlotte could be seen gently touching her older brother's arm and encouraging him to straighten up.
George immediately stood up straight and put his arms by his sides.
Following his father William and grandfather Charles, George, the queen's great-grandson, is third in line to the throne. Charlotte is number four.
Charlotte didn't just keep an eye on her boys during the party.
Louis waved enthusiastically to the spectators during the Trooping the Colour parade until Charlotte intervened. Louis also attempted to put his feet up on Charlotte's lap during the pageant on Sunday. But, having had enough of his shenanigans, the princess pushed her younger brother away from her and settled down to enjoy the show.
It is estimated that the royal pageant cost up to $18 million to put together. It is the queen's fourth since her father, King George VI, died in February 1952, and she became Queen in February 1952. The first royal pageant was held in 1809 to commemorate the 50th year of George III's reign.
Elizabeth is the first queen in the United Kingdom to attend a Platinum Jubilee.