The 26-year-old pop star is delighted that the Duke and Duchess of Cambridge's third child shares a name with him and he's going to send the tot an Adidas tracksuit, his trademark sportswear, to welcome him to the world.
"Seven years ago today - thank you for all the lovely messages on The Duke and Duchess of Cambridge's wedding anniversary", Kensington Palace captioned the photo.
On Monday evening, 36-year-old Catherine - who also has four-year-old Prince George and two-year-old Princess Charlotte with Prince William - left St Mary's hospital in Paddington, London, and was pictured outside the ward with her 35-year-old spouse and their new arrival.
Kensington Palace toasted the landmark date by tweeting a cute photograph of William and Kate together on their special day to it's 1.3million followers.
While the eldest of Kate and Wills brood had to return to school on Tuesday morning, Princess Charlotte only had to go to nursery on Thursday morning, which gave her more time to bond with her little brother.
"The baby weighs 8lbs 7oz".
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It read: "Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 1101hrs".
According to the same source, the little royals were so excited about their new family member that they would have likely skipped their usual bedtime and stayed up until their mum and dad returned home.
His regulation said that only the monarch, their children, their grandchildren and one other person could be called His or Her Royal Highness - this person being the Prince of Wales' first grandson.
Mr Cambridge's gran Victoria, 74, used to stand on the side of the road and wave at the Queen Mum every year when she was being driven to the Cheltenham racecourse for the Gold Cup.
Louis is known to be a favourite name of the Cambridge family.
The name pays tribute twice over to Prince Charles, who has Arthur as one of his middle names.