Middleton made the surprise appearance on Monday at Platform 1 at Paddington station in London alongside the cast members of the upcoming "Paddington Bear" movie.
Kate Middleton has stayed mostly mum since her third pregnancy was announced in early September - not out of choice, but rather due to her acute morning sickness known as hyperemesis gravidarum, which has kept her on strict bedrest for weeks.
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The children taking part were selected by members of the royal trio's Charities Forum - with many going through hard times in their lives. At the end of the engagement, William, Kate and Harry waved off the Belmond British Pullman as it departed Paddington and journeyed through the English Countryside.
The children taking part in the event were selected by members of the royal trio's Charities Forum, with many going through hard times in their lives.
At the end of their dance, Paddington, ever the gentleman (or should we say gentlebear), kissed Middleton's hand to bid her aideu.
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Kate caused a flurry of excitement when she stopped to talk to Amelia Kubas, aged seven, and 10-year-old Mahira Gazi, both from Portway Primary School, in Stratford, east London.
She added: "I asked her what's it like to be a princess, because I'd like to be one, and she said her favourite thing was meeting special people like us".
But the real star of the event was Paddington Bear himself, who appeared in all his furry splendor, complete with his trademark blue overcoat, on Monday.
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