The Duchess of Cambridge is a busy mum, with three kids who are under the age of six.
But it seems that it's her baby, Prince Louis, that is getting up to most mischief.
The eleven-month-old tot has reached another milestone and proud mum Kate was proudly talking about it when she visited Henry Fawcett Centre in Kennington, south London.
She told fellow mum Kriti, who was there with her nine-month-old son Kameron that, ''Louis just wants to pull himself up all the time.''
Kriti said, ''He has got these little walkers and is bombing around in them."
She added, ''She took one look at Kameron and said, 'Oh he wants to go walkies.' Apparently her son is cruising (when a child pulls themselves up and uses furniture to move about) and she said she was running after him all the time."
Kate met a room of toddlers during her visit and she played with twins Kamina and Kashay, who are nearly two-years-old.
Kate was visiting the centre to learn more about support being offered to young people and their families through Lambeth Early Action Partnership.
Kate had spoken out about Prince Louis and said that he was ''already a fast crawler.''
William also revealed on a separate engagement that the Prince was teething.
It looks like Louis is growing up - and fast.