The Duchess of Cambridge won the sympathy of parents everywhere as she tried to calm a restless Prince Louis at the Queen's Platinum Jubilee celebrations.
The four-year-old sat alongside his parents and big brother and sister Prince George and Princess Charlotte in the Royal Box during Sunday's Jubilee pageant.
During the long procession, he could be seen pulling a series of expressions as he enjoyed the colourful performers who went past.
And at one point, it seemed to all get a bit too much for the youngster who was seen trying to cover his mum's mouth and blowing raspberries at her.
And lip reader Jeremy Freeman has revealed what Kate said to her youngest son as she tried to stop his cheeky behaviour.
He told the Daily Star that when Kate spotted Louis putting his hands near his mouth and nose and she moved them away, she told the little boy: "You have to."
Mr Freeman then believes Louis tells her "I don't want to" before he puts his hands over her mouth and turns his attention back to the parade.
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He then says that Kate followed up by saying: "I said no hands..." and adding "look" trying to get Louis back to watch the performers.
But instead, Louis decided to stick his tongue out and blow raspberries at his mum forcing Kate to firmly tell him: "Stop doing that."
It comes as Louis stole the show during his two appearances at the Queen's Platinum Jubilee celebrations.
But was he actually being naughty when we saw him on the balcony of Buckingham Palace on Thursday and at the Pageant on Sunday?
Parenting expert Jo Frost, best known for her TV show 'Supernanny' doesn't think so - and claims she wouldn't have put him on her iconic 'naughty step'.
Speaking to The Mirror, Frost said: "For such a young age, Prince Louis did extremely well with Royal protocol on the balcony. There was much to take in and absorb, no doubt beautifully overwhelming.
"I agree with the sentiment that what we saw was an insight into Louis' personality and quirky temperament which was a delight to see.
"[At the Pageant] what we all saw was a four-year-old holding up physically strong to a long day, with sitting and doing lots of things that aren't involved in a typical day for Prince Louis, like most children if they go to a special event.
"I think The Duchess of Cambridge had the right measure of being empathetic to Prince Louis' needs and holding firm with boundaries when he was testing them. So no time out needed."
