Kate Middleton has a contagious smile and laugh.

The Duchess of Cambridge is very expressive. She doesn’t mind how she looks when she starts laughing or smiling which prompted BuzzFeed to describe Middleton as the “most animated person that ever lived.” For the publication, Prince William’s wife is a “wildly happy lady.”

In the photos shared by the publication, Middleton can be seen laughing with her fans, acquaintances and crowd of people. She also doesn’t hide her animated smile when she’s with her sister, Pippa Middleton, and husband, Prince William.

Middleton is an extremely happy individual. She smiles at whatever she does whether its during a tennis tournament, an arts and craft session, or photography workshop. She always find some reasons to smile.

Katie Nicholl shared a backstory behind Middleton’s smile. In her book “Kate: The Future Queen,” Nicholl said that Dr. Robert Acheson, former headmaster of St. Andrews’ Prep School passed a piece of wisdom to the duchess encouraging her to always smile.

“When Dr. and Mrs. Acheson left the school, Kate presented them with a teddy bear that everyone in the family had signed. She had carefully inscribed it with the words that Dr. Acheson had instilled in her: ‘I’ll always keep smiling,’” Nicholl wrote.

“She had the most fabulous smile, and I always told her, whatever happens in life, keep smiling,” Dr. Acheson said of Middleton.

In related news, Middleton is very protective of Princess Charlotte. Shortly after she was born, the Duke and Duchess of Cambridge posed on the steps at the Lindo Wing of St. Mary’s Hospital for Princess Charlotte’s public debut.

Middleton feared that their daughter would get cold. Prince William assured her that their little one was fine. However, Middleton insisted that they take her inside.

There are rumors that Prince William and Middleton are already expecting their fourth child and they are reportedly having another girl. New Idea shared photos of Middleton with what appears to be a baby bump. The palace has not confirmed the reports yet.

Kate Middleton Kate Middleton visits The Foundling Museum on March 19, 2019 in London. Photo: Getty Images/Eddie Mulholland