The Duke and Duchess of Cambridge are being kept on their "toes" by their son Prince Louis.
The young prince may only be 11 months old but he's already frightening his parents with his bold behaviour as his mother admitted during a visit to a secret WWII spy base in Bletchley Park, Buckinghamshire, that he's been climbing steep slides while her back is turned.
According to Royal correspondent Rebecca English, Catherine said: "Louis is keeping us on our toes. I turned around the other day and he was at the top of the slide - I had no idea!"
The 37-year-old royal - who also has son Prince George, five, and four-year-old daughter Princess Charlotte with her husband William - recently admitted that she was "naive" about how important the early years are for children when she first became a parent.