With a skip and a wave, little Princess Charlotte nearly stole the show as she and her brother, Prince George, arrived to meet their baby brother for the first time yesterday.
There was a concern this morning that the Duke and Duchess of Cambridge might leave their children at home rather than bring them to hospital in case they find the hundreds of photographers intimidating.
Kate delivered their third child in the exclusive Lindo Wing of London's St Mary's Hospital.
The Queen was also notified of the birth, she's said to be "delighted" at the news.
The couple welcomed their bonny baby boy at 11.01am, weighing in at a healthy 3.83kg - which makes him not only the biggest bub in the family (George weighed 3.79kg and Charlotte 3.71kg), but he's also the biggest baby born to an heir in 100 years.
The media pack then cooed and arred as the three royals made their way inside the hospital.
The newspapers at the time reported how William, who was dressed in red shorts, a white shirt with red embroidery, white ankle socks and traditional leather bar shoes, ran down the corridor into Diana's arms as she called his name.
Eager fans couldn't wait for news of the royal birth.
The newborn Prince is now 5th in line to the throne, nestling in behind older siblings Princess Charlotte and Prince George.
A third tweeted: "There is no human on the planet, royalist or otherwise, who can fail to be unaffected by Princess Charlotte waving as she enters the hospital".
Following the birth of her baby brother, Princess Charlotte has now become the first British female royal to retain her claim to the throne thanks to the Succession to the Crown Act of 2013.
These are the very first pictures of the newest addition to the royal family and some equally adorable pictures of the family's most dedicated supporters waiting in anticipation to see the baby before the rest of the world.
Just as George and Charlotte held onto their dad's hands, Charles held William's hand as they walked up the famous steps of the Lindo Wing.