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According to royal expert and editor of Majesty magazine Ingrid Seward, the Queen will ask Meghan to weigh herself before the feast on a pair of antique scales when she first arrives.
She will then be weighed again after Christmas dinner and lunch, The Sun reports.
It is reportedly a method to ensure all her family members are 'well fed' during the Christmas festivities.
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Even Prince William, Prince Harry and Meghan's mother Doria Ragland will be asked to participate in a weigh-in!
The odd tradition reportedly dates back to King Edward VII's reign in the early 1900s, and the royal family has followed it ever since.
