The tiny royal will be christened at The Chapel Royal, St James's Palace, London. Their sister, Charlotte, had her christening at St Mary Magdalene Church at the Queen's Sandringham estate in Norfolk.
Prince George is yet to be seen together with both his younger siblings, with the youngest Prince missing recent events including his uncle Prince Harry's wedding and the Queen's Birthday Parade, Trooping the Colour.
Now eight weeks old, he was born in London on 23 April, weighing 8lb 7oz.
"So if you follow that model for Prince Louis' christening, I wouldn't be surprised if it was announced for the end of this month or July". Prince George's christening back in 2013 only had 22 guests, with only senior royals, four members of the Middleton family, the seven godparents and their spouses among the guests.
Christenings are a must for royal babies.
The baptism will be a private affair, lasting around 30 minutes.
He was on his best behaviour, blowing bubbles beforehand and being quiet and peaceful afterwards.
The lovely picture, which was taken by the Duchess, showed the baby Prince dressed in delicate white and propped up on a cosy cushion. James, Viscount Severn, was the first baby to wear the new outfit at his christening in 2008. Welby in May performed the wedding of Harry and Meghan, Duke and Duchess of Sussex.