The Royal Norfolk Show's champion cattle farmer said she was "surprised and very honoured" to be handed her trophy by the Prince of Wales.
Prince William presented the overall inter-breed beef champion's prize during his unexpected tour of the livestock rings at the showground.
The winner was Mary Reynolds, of LEP Farms at Chidden, in Hampshire, with her Beef Shorthorn named Meonhill Secret Katie.
"It was a big surprise this morning," she said. "I am very honoured indeed - who wouldn't be?
"He [Prince William] was offering to fill up the cup with champagne, but we declined that kind offer as we didn't think perhaps we could do any work afterwards.
"It was very light-hearted and humorous of him. He came across very well indeed."
It was the culmination of a very successful show for the champion, which was also part of the five-strong team of Beef Shorthorn cattle from across the country which won the Heygates Country Feeds Team of Five competition on day one.
The team also included Tina Russell from Oxford, Charlie Maclean from Cambridge, and Graham Hunt and Chris Yeoman, both showing cattle from Yorkshire.
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