Proud grandfather the Prince of Wales and Duchess of Cornwall did attend, along with the Duke and Duchess of Sussex who walked hand-in-hand.
Princess Charlotte has a reputation for being confident in front of the cameras that follow her and her family everywhere.
If the moniker sounds familiar, you should know that it previously belonged to the late Princess Diana.
Nevertheless, only time will tell.
Prince George and Princess Charlotte were not present on the balcony to watch the flyover, however they did watch the festivities from a window of Buckingham Palace, where their nanny Maria Teresa Borrallo kept a close eye on them.
England fans make late dash to Russian Federation for World Cup semi-final
ESPN's Charlie Gibson is in St Petersburg to take in all the sights and sounds of France's World Cup semifinal win over Belgium. But FIFA said it had been informed "that due to medical reasons, the boys will not be in a position to travel to Moscow".
Prince William-hand-in-hand with Princess Charlotte-can't help but hold back laughter. In April he underwent planned hip surgery, but attended the wedding of Prince Harry and Meghan Markle just a few weeks later, walking unaided.
From the duchess's side, Kate's parents Michael and Carole, brother James, pregnant sister Pippa and her husband James Matthews were there.
In April, she delighted fans when she accompanied her father and brother to the Lindo Wing to meet Prince Louis for the first time and began waving as soon as she stepped out of the family vehicle.
And William's first day at Jane Mynor's nursery school went went swimmingly, the young prince returning home with a finger mouse and his Postman Pat thermos.
The Duke and Duchess of Cambridge also announced their youngest son's godparents a few hours before the service.