The Duke and Duchess of Cambridge announced that they were expecting their second child yesterday – and William's cheeky younger brother Harry was quick to poke fun at the sleepless nights they will be having.
Speaking with BBC News, he said: "It's very exciting news. I can't wait to see my brother suffer more!
"With any luck and it's a girl I'll see him suffer even greater. I'd love to see him try and cope with that."
But, turning serious for a moment, Harry also revealed that he is concerned for his sister-in-law's wellbeing.
He said: "In all seriousness, I hope my sister-in-law gets better soon and the two of them have the opportunity to go through the whole process again in a little bit of peace and quiet.
"She's pretty poorly, but luckily I'm not a woman and I don't have to go through that. She's doing the best she can."
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Kate Middleton - better known as Catherine, the Duchess of Cambridge - is once again suffering from hyperemesis gravidarum (extreme morning sickness), which saw her hospitalised during the first few weeks of her pregnancy with Prince George.
This means that she is currently receiving treatment at home in Kensington Palace, and will also be given regular check-ups by Alan Farthing, the Queen’s surgeon-gynaecologist and Guy Thorpe-Beeston, the Royal Household surgeon-gynaecologist.
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Despite this, however, Harry looked thrilled about his growing family and said: "I think George will be over the moon to have a smaller, younger, brother or sister."
We bet he will too!