The pregnant Duchess of Cambridge put her morning sickness behind her when Paddington Bear asked her for a dance as she made a surprise visit to the London station.
Kate and the famous children's character twirled and shimmied on platform one at Paddington station, where Michael Bond's creation was founded many years ago.
The impromptu ballroom dancing-style exhibition happened as Kate, the Duke of Cambridge and Prince Harry waved off a group of children from the station, as they embarked on a day trip in a vintage carriages pulled by a steam locomotive.
Kate, who is pregnant with her third child, is suffering from hyperemesis gravidarum - a severe form of morning sickness - but made a surprise appearance at the event, where the youngsters met some of the stars of the new Paddington II movie - including Hugh Bonneville.
Prince William, Prince Harry and Kate were meeting a group of children who have been helped by their charities.
During the visit, the Duchess looked relaxed and wore an outfit by designer Orla Kiely.
Regarding the Duchess' health, a Kensington Palace spokeswoman said "she's better, but she's still suffering".
The youngsters taking part have been selected by members of the Duke, Duchess and Prince's Charities Forum - with many going through difficult times in their lives.
More than 30 organisations are involved in the Forum - charities William, Kate and Harry support as patrons and other organisations they work with closely.
William, Kate and Harry boarded the British Pullman to talk to the youngsters before the train took them on a journey through the English countryside.
Later, as they waited to wave them off, Paddington Bear, complete with his famous duffle coat and hat, began dancing in front of them to music from a calypso band and, when he offered his hand to Kate, she took it.
The Duchess may have towered above the famous bear but they moved in time together and Paddington even twirled Kate around as the dance ended.
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Still in character, the actor inside the bear, who declined to give their name, said: "She's a right good mover, and I think she could win Strictly Come Dancing - if she was in it."
Paddington II is released in cinemas November 10.
