During a visit to a vineyard in New Zealand, Hannah Armstrong, from Mudhouse Wines, said: "Kate said she hadn't drunk whilst pregnant with George and, although she doesn't drink much, she was really enjoying the odd glass."
The Duchess, 32, tried a couple of glasses of Aurum pinot gris and a dry Riesling from a vineyard called Remarkable.
But it is her husband William - and brother Harry - who are the wine lovers in the family. Hannah, 28, said: "Kate said she doesn't drink much, but William likes his wine. I said: 'And of course Harry' - she laughed and agreed."
John Darby, owner of Amisfield vineyard in Queenstown, showed the royal couple round the vineyard - where Kate nearly fell over in her Russell and Bromley cork wedge heels, grabbing William's arm to steady herself.
Speculation had mounted that Prince George could soon have a brother or sister after William hinted another baby may not be too far off.
He encouraged a well-wisher to make a second baby gift after giving them one for their son.