While attending an official event in Finland, the royal dad-of-two handed over a written note from his son.
In what is clearly George's handwriting, the four-year-old informs Santa that all he wants is a 'police car' under his tree.
And he wasn’t greedy in his holiday requests — the little prince left four of the five lines on the pre-printed note empty.
Pulling out the note during a visit to a festive market, William, 35, told Santa, 'I’ve seen you and I had to give you this letter.'
'He hasn’t written down many requests, so I think one request is probably okay,' William said.
William even added that his son had been 'nice' during the past year — the schoolboy prince had circled nice rather than naughty at the top of the letter.