William and Kate have shown off their beloved newborn prince to the world for the first time as the pair left St Mary's hospital this evening.
Beaming with pride the couple - both donning aptly baby blue garb - held their new child in front of dozens of gathered reporters outside.
The Duke and Duchess of Cambridge proudly showed the world their baby son, a future king, before taking him home tonight.
William and Kate began their new lives as parents, cradling their baby prince and posing for pictures on the steps of the Lindo Wing of St Mary's.
William held his son and walked forward with his wife to answer a few questions.
He began by joking: "He's got a good pair of lungs on him, that's for sure. He's a big boy, he's quite heavy. We are still working on a name so we will have that as soon as we can."
He added: "It's the first time we have seen him really so we are having a proper chance to catch up."
The Duchess, who still had a bump under her summer dress, said: "It's very emotional, it's such a special time. I think any parent will know what this feeling feels like."
Her husband agreed: "It's very special."
He added: "I'll remind him of his tardiness when he's a bit older. I know how long you've all been standing here so hopefully the hospital and you guys can all go back to normal now and we can go and look after him."
Moments earlier the Queen said she is "thrilled" at the arrival of her great-grandson, according to a guest at a Buckingham Palace reception.
Prince Charles and his wife Camilla arrived this afternoon to visit his first grandchild in hospital just after a visit from Kate's parents earlier in the day.
The pair smiled and waved to the raft of international media gathered across from St Mary's Hospital following the birth of William and Kate's newborn yesterday afternoon.
The Duke and Duchess of Cambridge and their new son were also visited by proud grandparents Michael and Carole Middleton today.
Kate's parents travelled to the Lindo Wing of St Mary's in London to see their daughter and William, and the baby prince who will one day be king.
It was the first visit the royal couple and their son have received since the newborn was delivered yesterday at 4.24pm, weighing 8lb 6oz.
The Middletons arrived in a black cab and were greeted on the steps of the Lindo Wing by its lead clinician Jonathan Ramsay, before they walked up to the doorway.
The couple turned and smiled broadly as they posed for a few seconds for the world's media camped opposite the building, but did not reply to the many questions shouted out by journalists.
The Duke and Duchess earlier thanked the hospital staff who delivered their baby, describing the care they and their son received as "tremendous".
More to follow