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

— Kensington Palace (@KensingtonRoyal) October 16, 2017

The royal trio spent time meeting with the children aboard a British pullman vintage train that traversed the English countryside.

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) October 16, 2017

Wishing all of our young guests the trip of a lifetime! pic.twitter.com/NH8POS93pv

— Kensington Palace (@KensingtonRoyal) October 16, 2017

William told one of the children that Disney's \"The Lion King\" is the favorite movie of his son, 4-year-old Prince George. The movie tells the story of a young lion, Simba, who is the heir to the throne of his father, Mufasa.

One of the animated movie's classic moments is when Simba sings the song, \"I Just Can't Wait to Be King.\"

“He quite likes The Lion King,'\" William said of George, the third in line to the British throne. \"He's watched that a few times.\"

Actor Hugh Bonneville of \"Downton Abbey\" fame and a star of the new \"Paddington\" movie joined William, Kate, Harry and 130 children at the event. The children were nominated by the royals' Charities Forum.

The event was hosted by Studiocanal, a European film production company, with support from the British Academy of Film and Television Arts through its BAFTA Kids program.

Today’s special young passengers have been nominated by Their Royal Highnesses' Charities Forum pic.twitter.com/b2ON0YZ9zr

— Kensington Palace (@KensingtonRoyal) October 16, 2017

Kate appeared to debut a shorter haircut in only her second appearance since her third pregnancy was announced by Kensington Palace last month.

The duchess of Cambridge attended a Buckingham Palace reception last week to mark World Mental Health Day after taking time out of the public eye.

\"PHOTO:
Heathcliff OMalley/Reuters
PHOTO: Britain's Prince William, Duke of Cambridge, Catherine Duchess of Cambridge and Prince Harry celebrate World Mental Health Day at Buckingham Palace in London, Oct. 10, 2017.
>

Kensington Palace announced Kate's pregnancy on Sept. 4 when she was forced to cancel a planned engagement as a result of hyperemesis gravidarum. Kate also missed the first day of school for George a few days later.

Prince George arrives for his first day of school at Thomas's Battersea with his father The Duke of Cambridge. pic.twitter.com/B7TgcRA3Ve

— Kensington Palace (@KensingtonRoyal) September 7, 2017

The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting their third child pic.twitter.com/DZCheAj1RM

— Kensington Palace (@KensingtonRoyal) September 4, 2017

Later tonight, Harry will attend the Well Child Awards, a reception to celebrate bravery among seriously ill children and their families. Harry will present the Most Inspirational Child award.

Disney is the parent company of ABC News.

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