A lip reader has revealed the hilarious question Prince Louis supposedly asked his dad William at VE Day 80.
Festivities kicked off on Monday (5 May) to celebrate VE (Victory in Europe) Day, the Allies' victory over Adolf Hitler's Germany in World War II.
As the Red Arrows flew over Buckingham Palace a few days before Thursday's official VE Day date, the Prince and Princess of Wales and their children Prince George, Princess Charlotte and Prince Louis, waved to thousands from the palace balcony.
During the VE Day parade, Louis, seven, then took a seat next to the future King, 42, who was dressed in his military uniform.
Adorably, the young royal was seen brushing the water off his dad's jacket as they observed the military procession.
William then turned towards his son and looked to have tapped him on the leg.
Lip reading expert Nicola Hickling has revealed what she thinks the conversation was about.
She told The Sun that William said: "Look at this I think it's going to be quite wet today."
To which Louis was said to have replied: "Wasn't this supposed to be fun?"
Responding to the cheeky comment, William reportedly insisted: "It is son," and, "You will never forget this."
Prince Louis, seven, was sat next to Prince William to pay tribute to WWII veterans on the 80th anniversary of VE Day (Neil Mockford/GC Images) "They will come along here, and then go towards there, and then we will make our way back," he said.
"It's not going to be long and I want you to be taking an interest."
The lip reader also claimed that Princess Kate had a sweet message for her daughter Charlotte, 10.
"Doesn't papa look smart today," she said, according to Hickling.
A lip reader claimed Prince Louis asked his dad a hilarious question (EDDIE MULHOLLAND/POOL/AFP via Getty Images) Well, after the display, Prince George, 11, attended a veterans’ tea party with his parents. They spoke with 101-year-old Royal Engineers veteran Alfred Littlefield, who served during D-Day.
George reportedly enjoyed listening in on his father's conversation with Littlefield, before William said to veteran Douglas Hyde, who was with the Navy when he was 18 in 1944, that his son was 'very keen' to ask the former serviceman some questions.
The Royal Family looked like they were enjoying themselves (Chris Jackson/Getty Images) Littlefield’s granddaughter, Samantha Davidson, 58, from Denmead in Hampshire, told PA: “The Prince said George is very interested in finding out about the veterans.
“George even asked my grandfather how old he was during his service.”
She said Littlefield was delighted to find out how interested George was in the past.
Littlefield added: “I’m very proud.”
As well as showing a mature side, George also reminded us that he's, indeed, still a child after he was seen fixing his hair when his younger brother Louis appeared to take the mickey out of how he flicked it up.
The clip went viral on social media, displaying brotherly love at its finest.