Princess Kate and Prince George share sneezing laugh on Palace balcony

Princess Kate could sympathise with her eldest son after being spotted sneezing herself earlier in the Trooping the Colour procession. 

The Princess of Wales is understood to have a horse allergy, making the grand military spectacle particularly challenging, given the prominent role of mounted regiments throughout the ceremony. 

Despite the inconvenience, she carried out her duties taking the moment in stride before later sharing a sweet laugh with Prince George over his own sneeze on the Buckingham Palace balcony.

Prince George then sparked a heartwarming mother-son moment after struggling to hold back a sneeze during the national anthem.

The 12-year-old future King did his best to remain composed as the anthem drew to a close, patiently waiting until the final notes had finished before letting out a small sneeze.

George quickly covered his nose and mouth before turning to his mother, the Princess of Wales, who couldn't help but smile at the relatable moment.

Catherine immediately offered her eldest son a warm "bless you," gently placing a reassuring hand on his back.

"I'm alright," George replied with a nod, prompting the pair to share a laugh as millions watching around the world caught the sweet exchange.

Prince George, Princess Charlotte and Prince Louis sat proudly in their carriage, smiling and waving to thousands of well-wishers lining The Mall as they took part in one of the Royal Family's most important annual celebrations.