The pair are expected to be spending the day with the Middleton family at their home in Berkshire.
Carole Middleton, Kate's mother, revealed that she has recently largely ditched animal products - and will be serving a vegan option alongside the traditional meal.
"I've recently gone vegan," Carole told The Sunday Telegraph's Stella magazine. "Or maybe that should be flexitarian.
"If I go to someone’s house for dinner, I'm not going to make a fuss.
"For Christmas, I'd probably have two options – very traditional and something vegan."
It is not known whether Kate and William will tuck into Carole's vegan offering.
The royal pair have come under fire for sharing a passion for killing animals - taking part in hunting and shooting rituals.
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Maria is the Editor of Plant Based News. A former magazine editor, newspaper reporter, and features writer, her work has been published by The Guardian, The Huffington Post, and various regional newspapers. She was previously the editor of Vegan Life magazine and Vegan Trade Journal. She has interviewed a huge range of people, from Prime Ministers to authors, activists, pop stars and actors, and enjoys the varied range of topics writing for PBN allows her to tackle. You can follow her on Twitter @MariaChiorando and Instagram @mariachiorando.
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