William and Kate were on a visit to the Mumbles seafront in Swansea when she was reunited with Denise Evans-Allford and husband Kevin Allford, who she had not seen for nearly 25 years.
While spending time at sea, Kate and Prince William also hit a quaint little ice cream shop, where they chatted with the public about a variety of topics, including Kate's "5 Big Questions on the Under Fives" survey, which she launched earlier in February during a trip to Cardiff. Kate also wore her customized Gold Midnight Moon necklace from Daniella Draper, available online for $1,400, which shows the initials of her three children - Prince George, 6, Princess Charlotte, 4, and Prince Louis, 1 - alongside a trio of diamond stars.
The couple taught Kate, as well as her siblings, at St Andrew's prep school in Pangbourne, Berkshire.
Rhian recalled to the Daily Mail: "My daughter and I met Kate Middleton today at Mumbles pier, where we waited an hour to see her". While carrying out royal engagements in Mumbles, the Duchess of Cambridge had a reunion with two of her primary school teachers.
The couple have kept in touch with fellow pupils and teachers, who have been in touch after news of their meeting with Kate emerged. "Rhian gushed her daughter had been" incredibly blessed", because Kate" came directly over" into them. "This was not met with the smiling faces that you saw on the final edited version of the show", Sean said.
Mr Allford said Kate was always confident speaking to both adults and children and they described how happy Kate had been at St Andrew's.
"We had to put the sails up and they came back and got us". We didn't have to do anything in the end because she instigated a hug right away. We haven't seen her since then.
"After she left us, she got in the auto next to William and said "They're my former prep school tutors", and he said "Oh, wow" and made a special effort to wave at us".
"After she left us, she got in the vehicle next to William and said, "They're my former prep school tutors", and he said, "Oh, wow" and made a special effort to wave at us".