See how quickly Prince Louis has grown up in all his official portraits

The family shared another picture from the same series, this time with Prince Louis being held and kissed by his doting older sister, Princess Charlotte.

Doesn't he look happy to have been christened? In July 2018, when Prince Louis was just two-and-a-half months old, the royal family celebrated his christening at the Chapel Royal, St James's Palace. A week or so later, they shared some of the official portraits from the day, including this cute one showing off the baby prince's megawatt smile.

In a photograph released following Prince Philip's sad death, a baby Prince Louis can be seen on his great-grandmother Queen Elizabeth's lap, surrounded by his siblings and second cousins.

Prince Louis features in this family photo taken in celebration of grandfather Prince Charles' 70th birthday. While it wasn't released until November to coincide with the Prince of Wales' big day, the portrait is believed to have been taken in September, when Louis was five months old. Loving the kids' co-ordinated outfits!

For the Cambridge's Christmas card in 2018, the whole family posed outdoors at their Norfolk home, Anmer Hall. Although the picture wasn't released until Christmas time, the autumnal colours and the look of the leaves suggest the portrait was actually taken in October or November, making Prince Louis six or seven months old. Doesn't he look like an adorable little old man??

It was a while before we saw Prince Louis photographed again; this photograph was released the day before his first birthday - and look how much he's grown! That little jumper.

Another in Louis' first birthday photo series, the toddling royal is seen close up, gazing down the camera and looking very much like his dad.

By the age of one, Prince Louis was full steam ahead with his walking - shown off in this sweet picture taken at the Chelsea Flower Show. The family was photographed playing in the garden mum Kate had designed for the show, and by the looks of it, Louis was absolutely loving the exploration.

In another picture from the Chelsea Flower Show, little Louis was seen getting curious at the world around him with mum Kate Middleton. We can't get enough of his cute blonde hair combed to the side💔.

At the grand old age of 14 months old, Prince Louis made his first live appearance at an official royal event. In celebration of Trooping the Colour, the one-year-old royal appeared on the balcony alongside his parents and siblings, Prince George and Princess Charlotte. And we couldn't help but laugh at his many hilarious expressions.

It was then another quiet few months for little Louis, who was kept largely out of the royal spotlight until December 2019 when he was seen in a family photo shared by the Cambridges on Christmas Day. Taken by Kate Middleton, the picture featured Prince William in a flat cap, kissing Louis on the cheek, with Charlotte and George by his side.

Happy second birthday, Prince Louis! In the next official photograph of the royal toddler, he looks noticeably more grown up. With darker hair than he'd had previously, and dressed in a cute little checked shirt, Louis is definitely a little boy and no longer a baby! Where does that time go..?

As we neared the end of the first lockdown, Kensington Palace released this photograph for Prince William's birthday, featuring him with all three of his children, in which Prince Louis can be seen sitting on his dad's knee with some lockown-long hair.

A glittering YouTube career ahead? Louis starred alongside his brother, Prince George, and his sister, Princess Charlotte in a video asking naturalist David Attenborough all of the questions. This was the first time we'd heard any of the Cambridge kids speak in public and it's really quite adorable.

A delighted Prince Louis features front and centre of the Cambridges' 2020 family Christmas card, which was taken by photographer Matt Porteous. At two-and-a-half, Louis looks to be morphing somewhat into his older brother, Prince George.

Little Prince Louis had a big day out just before Christmas 2020, as he made his debut red carpet appearance along with his siblings and their parents at a London pantomime. And all onlookers could comment on was just how much Louis looks the spitting image of his grandad, Michael Middleton.

Quite unbelievably, Louis is now three-years-old! To mark the happy occasion, the Duke and Duchess of Cambridge shared a photo of Louis ahead of his first day at nursery (taken by Kate herself).