The Duchess of Cambridge joined guests from the arts and culture world at the Natural History Museum in London for the Art Fund Museum of the Year Award.
Kate arrived at the museum in a cream-coloured dress by Barbara Casasola, and was greeted by the institution's director Sir Michael Dixon, and Dr Stephen Deuchar, director of the Art Fund.
A £100,000 award - the largest museum prize in the world - is given annually to one outstanding museum which has shown exceptional imagination, innovation and achievement.
Artists attending the event include Cornelia Parker, Antony Gormley and Grayson Perry.
Kate, who is patron of the Natural History Museum, spoke to representatives from the five museums shortlisted for this year's prize.
Nicky Wilson, of Jupiter Artland, West Lothian, said she was delighted to meet Kate, who told her Prince George has enjoyed a number of visits to the museum.
"She said he comes here quite often. He loves the 3D sculptures," Ms Wilson said.
The museums shortlisted for this year's award are Jupiter Artland, Arnolfini, Bethlem Museum of the Mind, the Victoria and Albert Museum (V&A), and the York Art Gallery.