Prince William and Kate reveal new patronage while hanging with kids at children's hospital - see all the photos

Duchess Kate surprised fans on Tuesday (Dec. 11) by announcing her new patronage - Evelina House, where she and Prince William were headed for a festive few hours of fun with children receiving treatment at the 150-year-old children's hospital. <p>The mother of three was dressed to impress in a green polka dot dress and matching pumps, while her husband wore a black suit with a blue shirt. <p>Later, they popped over to The Passage charity, a homeless centre that helps disadvantaged people to turn their lives around. <p><strong>Click through to see all the best photos from their day out!</strong> <p>Photo: &copy; Getty Images 
"We are absolutely delighted and deeply honoured The Duchess of Cambridge has chosen to become our Patron," said Marian Ridley, Director of Evelina London, when the patronage was announced. "The Duchess shares our passion for giving children and young people the very best start in life and Her Royal Highness' support will help champion the life-saving care our staff are providing to our patients. <p>"It is a huge pleasure to welcome Their Royal Highnesses back to our hospital and we are absolutely delighted that they are able to join us as we begin to celebrate our milestone 150th anniversary. We are immensely grateful for Their Royal Highnesses' support and we look forward to working closely with The Duchess as our Patron." <p>Photo: &copy; Getty Images 
The 36-year-old stunned in a festive L.K.Bennett shirtdress with buttons from the waist up and billowy sleeves. She anchored the look with olive suede pumps and carried a matching clutch. <p>Photo: &copy; Getty Images 
A sweet young girl gave the duchess a bouquet when she arrived with Prince William. <p>Photo: &copy; Getty Images 
The duke and duchess took part in fun Christmas-themed activities with children at the hospital and their parents. <p>Photo: &copy; Getty Images 
Artistic Kate definitely had a lot to teach the kiddies about arts and crafts! <p>Photo: &copy; Getty Images 
The duchess delighted in a cuddle with this adorable little girl! <p>Photo: &copy; Getty Images 
The mother of three helped Cruz Brown, this sweet four-year-old boy, unveil a banner that he's featured on! <p>Photo: &copy; Getty Images 
As new patron of the hospital, Duchess Kate addressed the staff and patients. <p>Photo: &copy; Getty Images 
The couple looked at a special 150th anniversary plaque with the children. <p>Photo: &copy; Getty Images 
© 2001-2019, HELLO! - All rights reserved