Prince William and Kate Middleton have welcomed their third child, and although the new tot hasn't been given a name, it's been revealed what his older siblings will call him.
Prince George reportedly has a nickname for his little brother, and it is seriously adorable!
While Kate was still pregnant, a source revealed: ‘George has started calling the baby Peanut in Kate's tummy.'
'When he saw the ultrasound pic, he told his mum that it looked just like a little peanut - and the name took off from there!’
George was super excited to meet the new royal baby and he has already introduced himself to the upcoming bub.
'Now, Wills and Kate are wondering if he'll ever call the baby by its real name when they announce it, or if it will be "Peanut" for life!'
Bookmakers have reported a surge in bets on the name Arthur for the royal baby, who is fifth in line to the throne.