In July 2013, Prince George Alexander Louis of Cambridge made his grand entrance.
The first child of Prince William and Duchess Catherine, Prince George became an overnight icon and the world's ultimate spirit animal thanks to his huge range of hilarious faces and charming antics.
Then, in May 2015 George became a brother as his little sister Princess Charlotte Elizabeth Diana of Cambridge joined the scene.
According to their proud parents, Princess Charlotte, two, and Prince George, four, have developed strong little personalities.
"George rules the roost and Charlotte isn't far behind," Prince William has said.
And now, as Duchess Catherine prepares to welcome her third child their family dynamic is about to get a serious shakeup.
Before they welcome the newest member into their VIP club, we celebrate Prince George and Princess Charlotte's best moments!