Prince Harry declared tonight he was ready to play the proud, protective uncle for his new nephew Prince George and "make sure he has fun".
Harry could not stop beaming as he talked about the newest member of his family during his visit to a photographic exhibition in London documenting the work of his Africa-based charity Sentebale.
Asked what his mission was as an uncle the royal replied: "To make sure he has a good upbringing, and keep him out of harm's way and to make sure he has fun.
"The rest I'll leave to the parents."
The royal said he had already cuddled the Duke and Duchess of Cambridge's baby born on Monday and yesterday named by his parents George Alexander Louis - Prince George of Cambridge.
The baby is destined to become George VII if his grandfather, the Prince of Wales, and father, William, choose to use their first names when they become monarchs, and not a middle name.
The infant prince's name is thought to be in tribute to the Queen's father, King George VI.
The 28-year-old prince said: "When I saw him he was crying his eyes out like all babies do I suppose - it's fantastic to have another addition to the family.
"I only hope my brother knows how expensive my baby sitting charges are."
Ever the joker when asked what his nephew was like he held up his hands and said: "Well he's about that long and about that wide."