Four families, whose children are based in Welsh hospice Ty Hafan, near Cardiff, braved the harsh weather conditions to make the trip to Charles and Camilla's Gloucestershire home.
And with the grounds completely covered in snow, Prince Charles' mischievous wife threw a snowball outside for the cameras.
The children, who came bearing Christmas cards for their host, were entertained by a magician.
Ty Hafan Children's Hospice, which costs £2.5 million a year to run, provides care to children in Wales who suffer from life-limiting conditions.
Among those meeting Camilla was three year-old Sienna Mason, who came with her sisters and mum and dad.
Sienna's mum said: "We chatted with the Duchess about normal everyday life, she is very charming.
"She even talked to Sienna about her favourite book Peppa Pig and knew the characters surprisingly."