A six-year-old schoolgirl was hit in the face by a soldier moments after presenting the Queen with a bouquet of flowers.
The unfortunate mistake happened when Maisie Gregory met Her Majesty during an official visit to Cardiff.
Her Royal Highness was walking away after meeting Maisie when a soldier saluted - striking the little girl in the face at the same time.
In footage of the incident, Maisie is heard exclaiming: 'Ow!' as the Queen walks on, apparently unaware of what had happened.
It came after Her Majesty took a walk down the Millennium Stadium tunnel to present the Royal Welsh regiment with their new colours in a military ceremony full of pomp and grandeur.
Clad in sky blue, the 89-year-old strode onto the pitch - which has graced the likes of rugby stars like Sam Warburton, Jonny Wilkinson and Jonah Lomu - and was met with loud cheers from an 8,000 strong crowd.
Today's Cardiff ceremony was the final formal recognition of The Royal Welsh - which formed in 2006 after the merger of the Royal Welch Fusiliers and the Royal Regiment of Wales.
The event certainly seemed to please the Queen who called the large military parade "excellent" and "terrific" before meeting local dignitaries and army personnel and veterans in the home team dressing room.
And in an address to the stadium crowd, she said: "It gives me great pleasure to present these new colours to the battalions of the Royal Welsh here in the Millennium Stadium and to see so many of the regiment, your friends and families and the Comrades Associations gathered to witness and to enjoy this occasion.
"As your colonel in chief, I am also delighted to know that the City of Cardiff has granted the regiment the freedom of the city.
"This generous honour typifies the support that the people of Wales have given to its regiments over the years and I know this enduring link has been a great source of strength and encouragement, especially so during the regiment's recent operational deployments to Iraq and Afghanistan."
