Prince William has spoken candidly about his two-year-old daughter during a visit to Aintree University Hospital in Liverpool, England on Thursday.
“She's going to be trouble when she gets older,” William told patient Pagan Tordengrav. “All fathers say that to me -- watch out for the little girls.”
Of course, Princess Charlotte made headlines earlier in the year after partaking in what could have been the world’s sweetest meltdown.
The picture-perfect, mini-tantrum came just as the royal family were wrapping up their five-day tour of Germany and Poland. The little royal scrunch her face and stomped her feet before she was quickly soothed by her doting mother.
WATCH: Princess Charlotte throws a mini-meltdown. Post continues...
The Duchess of Cambridge, who announced her third pregnancy last week, was too under the weather with severe morning sickness to accompany her husband on the important hospital visit.
When asked after his wife’s health, William confirmed that she’s “very well” before expertly deflecting attention away from the matter.
Instead, the 35-year-old royal opened up his son’s first week of ‘big school.’
"George has been really easy. He hasn't said, 'Have I got to do this for the rest of my life?' George rules the roost but Charlotte's not far behind," he told patient Teresa Jones, 87, from Kirkby.
He later added: "George started school – we are all seeing how long that lasts before he doesn't want to go!"
Prince George started at Thomas’s Battersea in London on 7 September.
The four-year-old future King of England looked smart in his brand-new uniform made up of a navy V-neck jumper, a blue shirt, knee-length shorts, shiny black shoes and a backpack.
George, who appeared a little shy and nervous, was greeted at the gates by his head of the lower school, Helen Haslem, who held onto his hand while proud father Prince William joined them. The new pupil was then taken into reception and shown his classroom.
He might be third in line to the British throne, but the royal will be known simply as George Cambridge to his fellow classmates.
Young George has been enrolled in one of three reception classes at the co-educational outpost, and he will join a mixed class of boys and girls at the $AUD28,607 per year school.
Upholding a set of core values - kindness, courtesy, confidence, humility and learning to be givers, not takers - the elite school holds an impressive record of senior school entrance and scholarship successes.
In fact, the Tatler Schools Guide says the "cream of the Battersea crop rises to the likes of Eton and Wycombe Abbey.”
The school, which is just a stone’s throw from their royal residence, Kensington Palace, currently has 544 day pupils, aged between four and 13.
WATCH: Prince George hesitatingly begins his first day of 'big school.'