Everyone's talking about Baby Archie, but there's another little royal who is growing up fast.
On her most recent outing to Bletchely Park to view an exhibition celebrating codebreakers' role during the Second World War, Duchess Catherine revealed that her youngest child, Prince Louis, is coming into his own and has even developed a cheeky side.
According to the royal mum-of-three, Prince Louis "is keeping us on our toes," and hinted that he's already started to walk.
"I turned around the other day and he was at the top of the slide — I had no idea!" the Duchess of Cambridge revealed to a royal watcher.
Back when Prince Louis was just nine months old, royal photographer Mark Stewart said that Duchess Catherine told one woman at the Victoria and Albert museum that the little prince was "already a fast crawler." Clearly he's growing up fast!
WATCH: The first official photos of Prince Louis. Post continues after video....
The Daily Mail's Rebecca English also reported that Duchess Catherine was given four cuddly toys by the primary school codebreakers: a squirrel, fox, owl and rabbit for George, five, Charlotte, four, Louis, one and her new nephew Archie.
"They love wild animals. They will look after these," the Duchess said.
And if you're looking at Duchess Kate's dress and thinking it rings a bell, you're on to something.
The £1,750 polka dot Alessandra Rich dress was previously worn by the Duchess of Cambridge when the royals had an official photo shoot for Prince Charles' 70th birthday. And that adorable photo of little Louis reaching out and touching his grandpa's face should have given us a hint that he would be a cheeky child!
While Prince Louis is yet to make an official royal outing seeing as he's just over a year old, the fifth in line to the throne has appeared in many family photos.
Most recently, Kensington Palace released three photos of the little prince in celebration of his first birthday taken by Duchess Catherine herself at their home in Norfolk.