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Following her first appearance at World Mental Health Day event since pregnancy news, Kate Middleton made another appearance at a charity event, which everyone didn't see it coming. On October 16, Kate joined husband Prince William, brother-in-law Prince Harry and the cast and crew of "Paddington 2" at children's charity event at Paddington station in London.

At the event, they sent off 130 children from charities forum, which they support, for a train ride to English countryside with Belmond British Pullman train. The children that were invited were young survivors of the GrenFell Tower fire.

Their Royal Highnesses meet cast and crew from #Paddington2 who will join guests on their journey through the English countryside pic.twitter.com/M49jA2Keft

— Kensington Palace (@KensingtonRoyal) 16 Oktober 2017

The Princess and the Bear. Kate, and William, meet the star of Paddington II at his namesake station pic.twitter.com/alzG27W4jI

— Simon Perry (@SPerryPeoplemag) 16 Oktober 2017

Kate, in Orla Kiely dress, with Paddington II producer David Heyman at Paddington station. pic.twitter.com/uZSh2pOB7L

— Simon Perry (@SPerryPeoplemag) 16 Oktober 2017

The Duchess of Cambridge reportedly suffered from severe morning sickness called hyperemesis gravidarium, but she looked cheerful during the event. She even took the chance to dance with Paddington bear at the platform, showing off her dance skill.

Watch: Dancing queen? Kate is taken for a dance by Paddington bear before she waves off a vintage train pic.twitter.com/sfxqwUg089

— Simon Perry (@SPerryPeoplemag) 16 Oktober 2017

A royal aide told ABC News, "Her condition is improved, but the Duchess does continue to be affected by hyperemesis gravidarium. She is making decisions day to day but is keen to do as much as she can."

Before boarding the train, the royal trio decided to split up and took turns visiting the kids in the various train cars. They spent 45 minutes talking with the children, who have been going through difficult times in their lives, and it was reported that Kate had a long chat with Esther Windsor and her daughter Lilly from the Anna Freud Centre in North London.

The Duchess of Cambridge discussed many things with Lilly, including art. "So you're creative. It's great fun, isn't it?" Kate asked the 10-year-old girl. The two also discussed the first "Paddington" movie and even planned to watch the second installment.

After their chat, Esther commented that she was happy to meet Kate. "We really like the train and it's very nice to meet Kate. She seemed very well," she said.

Many of the children on today’s journey are going through difficult times in their lives pic.twitter.com/XlpIop2Q4O

— Kensington Palace (@KensingtonRoyal) 16 Oktober 2017

Meanwhile, when one woman asked Prince William if his wife attended the event or not, the Duke answered, "Yes, she's in another carriage. She is feeling much better."

The Duke and Duchess of Cambridge and Prince Harry arrive @Paddington Station to meet children going on a very special journey pic.twitter.com/b3QGDmpRca

— Kensington Palace (@KensingtonRoyal) 16 Oktober 2017

One of "Paddington 2" actors, Hugh Bonneville, also attended the event and praised the royal trio for their support of children's charities. He remarked, "Wherever they go awareness is brought to the causes they do wonderfully support. It's just fantastic when they can bring a bit of a spotlight to shine on these fantastic causes. Paddington is equally happy to smear them in marmalade!"