Kate told a florist that she did not think Prince William would buy her roses for Valentine's Day as she joked with members of the public.
The Princess of Wales also told students at the University of Leeds that visiting them made her "want to go back to uni".
During Kate’s visit to Kirkgate Market, florist Neil Ashcroft joked that February 14 was only two weeks away.
He said afterwards: "I suggested William will be buying her roses and she said, 'I don’t think he will!'"
Kate met with university students in Leeds
Chris Jackson
The Princess of Wales also visited Leeds university students on a childhood studies programme.
Kate told one group that visiting them "makes me want to be back at uni".
Yesterday the Princess was involved in a heartwarming moment with a visibly nervous fan.
The royal was asked for a photo by a fan that wanted to capture the moment he met Kate.
He said: "Can I get a selfie?"
Kate replied: "Yes you can, very quickly."
The fan added: "Sorry, I am really nervous."
The Princess responded: "Please don't worry, it's ok, we all get nervous.
"Nice to meet you, take care."
Kate posed for a selfie with a fan
On Monday evening, The Prince and Princess of Wales joined a star-studded reception at the home of British cinema ahead of Kate's ambitious Shaping US campaign to create better futures for young children.
The Princess of Wales said: "These are the most preventative years. By focusing our collective time, energy, and resources to build a supportive, nurturing world around the youngest members of our society and those caring for them, we can make a huge difference to the health and happiness of generations to come.
“All of society has a role to play in this, even if you are not directly involved in a child’s life, because we are all responsible for building a more compassionate world in which our children can grow, learn and live.
“In these difficult times, it is more important than ever to help support parents and caregivers provide loving, safe and secure homes for their babies and young children to thrive.”
