Thousands of people gather outside Buckingham Palace to see the Queen and her family on the balcony, and it's one of the few occasions that Brits get to see them all together.
One of the most exciting parts of any royal celebration is the Trooping the Colour flypast - a tradition that has marked the official birthday of the British Sovereign for over 260 years.
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However, all the excitement got a bit too much for Princess Charlotte during the Queen's 2018 birthday parade and had to be comforted by her mum, the Duchess of Cambridge, after bursting into tears.
The little royal, who is fourth in line to the throne, was having a lovely time with her second cousins, looking down at the crowds and waving excitedly. As the RAF planes flew over, she clapped excitedly and was seen saying: "Wow".
However, Charlotte, who was just three at the time, took a tumble - leading her to burst into tears during the celebrations.
Fortunately, Kate Middleton was on hand to rush and catch her as she fell and offer a comforting hug straight after.
The youngster looked upset as she turned round to see her mum, and as she started to cry Kate was quick to pick her up.
Before her little fall Princess Charlotte had been enjoying the show with cousin Savannah Phillips and brother Prince George.
Savannah, who was seven at the time, also caught the attention of the crowd as she joked around with cousins.
At times she could be seen jokingly conducting the orchestra, putting her hand over Prince George’s mouth, and looking incredibly excited about the occasion.
When Charlotte fell she looked immediately concerned and tried to assist her younger cousin before mum Kate stepped in to save the day.
