With Prince George's birthday coming up this week, we expect his loving parents, the Duke and Duchess of Cambridge, have planned lots of exciting things planned - including some great presents.
But there's one lasting tradition, inspired by his late grandmother Princess Diana, that has been running since he was a baby - and it causes Wills a headache every year.
The future king's godmother, Julia Samuel, 60, was a good friend of Diana.
Each year on Prince George's birthday she buys 'impossible' toys for the kids - that William has to spend days carefully assembling.
She said: "I do to George what [Diana] did to us, which is give impossible toys that are really noisy and take a lot of making.
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"William then has to spend days putting together. And then put all the machinery together, and it makes awful tooting noises and lights flashing and all of that."
While poor William struggles for days on end to put together the tricky toys, the rest of the family takes great pleasure in watching him squirm - especially "cheeky" George.
Ms Samuel said it "makes [her] laugh, and it makes George laugh."
She revealed the heart warming tradition when she was a guest on the podcast How to Fail with Elizabeth Day - in an episode last year to mark what would have been Diana's 59th birthday.
Describing her adorable godson, she said he was "amazing" - adding her dear friend Diana would have adored him too.
"He's funny and feisty and cheeky and God she [Diana] would have loved him so much," she said.
"That is heartbreaking for all of them."
Reminiscing on her friendship with the Princess of Wales, Ms Samuel said Diana's laugh was the memory she cherished most.
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