But he hasn't done it quickly. It's taken him 20 years. That's just over a pound a year!
The card shop, Clintons, have revealed that the usual image of Father Christmas on greetings cards has been slimmed down over the last two decades now that we're more conscious of our waist lines than ever before.
Well, at least he won't be getting stuck down the chimney with his trimmer figure!
But that's not all that's changed - card artists have also toned down his rosy red cheeks and his iconic bright red suit is now a deeper burgundy.
James Horne, a spokesperson for Clintons, was quoted in the Daily Star saying: "Depictions of Santa have become slimmer, possibly because we are more weight-conscious."
But company boss Tim Fairs has confirmed that their festive cards are still classically Christmas: "None of the old traditions are forgotten."
We guess Santa won't need any treats this Christmas Eve. We'll just have to eat them ourselves!
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