Guns play a large role in the British tradition, particularly Royal Gun Salutes, which are considered a "sign of respect" at various functions, such as the birthdays of the Queen, George, and Charlotte, according to the official website of the monarchy.
Prince George wore a navy blue polo shirt with Khaki shorts while his sister Charlotte wore a pink floral frock.
George and his friends were spotted playing with some toy guns. Aside from her acrobatic routine, Charlotte put her sunglasses on while she ran around the field.
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Meanwhile, Princess Charlotte did handstands, sending her mother into a fit of giggles.
It looks as though the toy gun came as part of a classic "police set" as the youngsters can also be seen with a plastic baton and some handcuffs and Prince George is known to have a fascination with the police and emergency services.
Sitting on a grass slope together, Savannah, 7, was pictured with her arm around Charlotte.
Prince Louis was born 23 April - so if history is to repeat itself, his big day could be any time from the end of June to mid-July. While Savannah got a swift telling off from her mum, Autumn, the future King turned to his mum for comfort, and Kate was snapped consoling the little Prince and stroking his cheek.
Most of the photos show the young boy running around or seated next to his mom, however some of the photos show the youngster holding up a small toy gun.