In July 2013, Prince George Alexander Louis of Cambridge made his grand entrance.
Then, in May 2015 George became a brother as his little sister Princess Charlotte Elizabeth Diana of Cambridge joined the scene.
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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 they welcome their baby brother Prince Louis into the fold, their family dynamic is about to get a serious shakeup.
As they welcome their new brother Prince Louis into their VIP club, we celebrate Prince George and Princess Charlotte's best moments!