Prince Louis and Princess Charlotte Accidentally Bump Heads on Balcony at Trooping the Colour

The little prince and princess knocked into each other while moving the same way at the birthday parade

Prince Louis and Princess Charlotte had a total sibling moment at Trooping the Colour!

The little prince and princess joined other members of the royal family at King Charles’ birthday parade last Saturday, where they traveled in a carriage to watch military processions at Horse Guards Parade and caught the epic flypast from the balcony of Buckingham Palace. In a blink-and-you’ll-miss-it moment shared to social media, Charlotte, 8, and Louis, 5, accidentally knocked their heads together while out on the balcony.

As seen in an Instagram video from @Royal.fairy.tale, Charlotte leaned to her right just as Louis turned to chat with Kate Middleton and Prince William, and their heads collided. Prince George, 9, didn’t react to what happened — and neither did Louis! — who kept talking. The tap seemingly whacked Charlotte harder than Louis, who gently touched her temple after the bump.

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The Prince and Princess of Wales’ children seemed to be on their best behavior during the festive flypast, where the Red Arrows Aerobatic Team of the Royal Air Force soared overhead. Prince Louis was ready for the noise and didn't cover his ears like last year! Kate and William’s youngest son attentively stood as “God Save the King” was played and even charmed the crowd with a salute before retreating into the royal residence. 

Fans also got a glimpse of Prince Louis’ playful personality during King Charles and Queen Camilla’s coronation celebrations just a few weeks ago. The little prince sweetly held hands with Charlotte on the way into Westminster Abbey for the crowning on May 6, but couldn’t help but yawn at one point during the two-hour church service.

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Louis later made a few funny faces during the carriage ride back to Buckingham Palace and clapped, pointed and danced when he appeared on the balcony there. He did not attend the Coronation Concert the next day (likely past his bedtime!) but tagged along with his family for The Big Help Out on May 8, which was a bank holiday in the U.K. to encourage volunteer work.

Prince William, Princess Kate and their three kids volunteered at the 3rd Upton Scout Group in Slough to pitch in on various projects, and a fellow helper exclusively told PEOPLE that Charlotte was ever ready to keep Louis in line.

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"She was advising him, obviously! 'Don't do that, Louis!' — things like that," Scout helper Anne Edwards said of what she saw when the siblings painted planter blocks, adding that it was sweet to see the Wales kids excited about volunteering.

"They were very relaxed and joining in, like normal kids. That was what was really nice about it," Edwards said.

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