The Duchess of Cambridge has joked with parents she will see them "at the school gates" when Prince George starts his education in September.
Kate was chatting to guests at the 2017 Portrait Gala in the National Portrait Gallery in London when the subject of George's school came up.
It was announced last week that the young Prince will attend Thomas's Battersea School from September.
As she toured around the gallery, Kate met parents from the school and told them she may see them there in future.
She spoke with Richard Found, who runs an architecture and design practice, and his wife Jane Suitor, an art consultant and collector, and they told the Duchess it was a "great school".
Mr Found said afterwards: "We were chatting about Thomas's, the school George will be going to.
"We're parents there as well. She just said 'I may see you at the school gates'."
Day fees cost £6,110, according to last year's Tatler Schools Guide.
George will be four years old when he starts at the private co-educational day school, which proudly states its most important rule is to "be kind".
Kate viewed the latest exhibitions and met guests at the gala, before having dinner at the London attraction.
The Duchess, who has been patron of the gallery since 2012, dazzled in a full length, lace green gown by Temperley, and hailed the "amazing" work on display.
She wore her hair loose and carried a gold sparkly clutch, finishing off her look with glittering drop earrings.
Among those she met as she made her way through the gallery were fashion designer Erdem and fashionista Alexa Chung who is chair of the 2017 gala committee.
She viewed two exhibitions - Howard Hodgkin: Absent Friends, and Gillian Wearing and Claude Cahun: Behind The Mask, Another Mask.
To help raise funds, a range of artwork has been especially created, including 10 masks by the likes of Dame Vivienne Westwood and Philip Treacy, and 100 postcard-sized works of art for a mystery portrait postcard sale.
Kate had the chance to view both of these collections during the evening and said of the postcards: "Well, they're all amazing."
This is the second gala that Kate has attended and, as in previous years, the funds raised will support the National Portrait Gallery's work in delivering exhibitions and displays, offering learning opportunities and undertaking research.
The 2017 gala is fundraising for Coming Home, a project that will make it possible for portraits of people to return to places that are special to them for a loan period of over three years.
Coming Home will enable sitters such as Sir Walter Raleigh to return to Dorset, the Bronte sisters to Yorkshire and David Beckham to Essex.
Earlier on Tuesday, it was announced that Kate will visit Luxembourg to attend commemorations marking the 150th anniversary of a treaty that confirmed the country's independence and neutrality.
She will travel to the country on May 11 to attend events celebrating the 1867 Treaty of London, at the request of the Foreign and Commonwealth Office.
The visit is likely to be interpreted as another trip being made by a member of the Royal Family in their role as "Brexit Ambassadors", as they have been dubbed by the press.