Ahead of the RAF flyover, Prince Louis could be seen peering through the Buckingham Palace windows with his sister to try and catch a glimpse of their father, the Duke of Cambridge, in the parade.
Prince Louis and Princess Charlotte could be seen looking through the Buckingham Palace windows ahead of the RAF flyover
The one-year-old gave his first royal wave on the Buckingham Palace balcony alongside his parents, Prince George and Princess Charlotte
The royal tot's highly-anticipated appearance echoes Prince George's Trooping the Colour debut, as the five-year-old also attended the annual parade shortly after his first birthday back in 2015.
A year later, Princess Charlotte joined the Windsor clan on the balcony at just 13-months-old, as she stole the spotlight with her crowd-pleasing waves.
Samir Hussein/ Getty Images
Princess Charlotte made her Buckingham Palace debut back in 2016
Prince Louis wasn't the only member of the royal household to make a surprise appearance this afternoon, as the Duchess of Sussex also took a break from maternity leave to attend the Queen's 93rd birthday celebrations.
The Duchess of Sussex chose a navy Givenchy ensemble for this year’s ceremony
For the occasion, she looked to her wedding dress designer Clare Waight Keller for sartorial assistance in a navy Givenchy ensemble finished with a matching Noel Stewart headpiece.