Despite there being space for the royal to list five gifts George reveals that all he would like for Christmas is a police vehicle before signing his name at the bottom.
Spotting Santa in a Christmas market in Helsinki, William ran up and pulled the four-year-old's letter out of his jacket pocket.
However as George's dad, the Duke of Cambridge, was on his way to Finland anyway, he personally delivered the note to Father Christmas.
Before meeting Father Christmas, William went on a walkabout in a nearby park, greeting hundreds of well-wishers who braved freezing conditions. The young royal left the remaining four spots on his list blank.
'He hasn't written down many requests, so I think one request is probably okay, ' William said. Kate is pregnant with the couple's third child.
"We're very excited and delighted for them both and wishing them all the happiness in this very exciting time", the prince said. At an event Wednesday, William joked that Harry's engagement now means that "he stays out of my fridge and will stop scrounging my food, which he's done for the last few years!"
Before leaving the ice rink earlier today, The Duke commented on the announcement of Prince Harry and Meghan Markle's engagement.