Since becoming a proud mum, the Duchess of Cambridge takes beautiful photos of her children that she releases on their birthdays.
The relaxed snaps give royal fans the chance to see Prince George, Princess Charlotte and Prince Louis as they grow up.
And just last week to mark George's ninth birthday, a new image by Kate was taken, with many fans remarking how much the youngster looks like his dad Prince William.
Similarly in May, when Charlotte turned seven, many also commented on the young princess's likeness to her father.
And according to a friend of Kate, this has led to her joking that little Louis is the only one out of the three kids that actually looks like her.
The friend told PEOPLE : "Everyone always comments on how Louis is the spitting image of Kate.
"She loves it and thinks it's very sweet — she often jokes that he's the only one of her kids who actually looks like her!"
However, it's not the only way that Louis is taking after Kate - he's also said to be following in her sporting footsteps by taking up one of her favourite sports.
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She let slip earlier this month that four-year-old Louis has also joined his older siblings in learning how to play tennis.
It came out during Kate's chat with Novak Djokovic - just minutes after he won his seventh Wimbledon title.
After presenting him with his trophy, TV cameras showed Kate in conversation with the seven-time Wimbledon winner as his name was added to the honours roll for 2022.
Djokovic told the Duchess that he had noticed George in the royal box and asked if he played tennis.
Kate told him: "George is playing. They're all playing, even Louis who's four. They're all keen."
It is believed that the Cambridge children have their tennis lessons at the exclusive Hurlingham Club in Fulham - not far from Kensington Palace in West London.
The club, which also has facilities for Croquet, Golf and Polo, charges £1,400 a year for membership.
In 2019, an insider told HELLO that the Cambridge children love visiting the club and that they go into the clubhouse afterwards for lunch or tea and act "just like any other normal family".
