Cameras caught Kate, the Duchess of Cambridge, politely declining to sample a bite of peanut paste as she and Prince William visited a United Nations aid depot in Copenhagen on Wednesday.
Doctors and government experts have long urged pregnant women to stay away from peanuts and their bi-products to avoid allergies.
While her husband and hosts, the Danish Crown Prince and his wife, dug into the paste, a staple of UNICEF packages handed out in areas suffering from famine, Kate said no. Reports say she also gave her husband a knowing look as he examined the paste's packaging and label.
Adding to the speculation is the reaction from the Palace, which is normally mum on all matters Kate.
"Her spokesman went out of their way to stress that she has no nut allergy whatsoever," Duncan Larcombe, royal editor for The Sun, told ABC News.
Also fanning the rumor mill is the timing of a potential pregnancy for Kate.
Just last week, the British parliament changed the country's succession rules -- in place for more than 300 years -- to allow females to become the head of the monarchy. In other words, if Kate is indeed pregnant, and it's a girl, the baby could be Queen.
British Prime Minister David Cameron was said to have initiated the change in the rules so that the first child of William and Kate could benefit regardless of the sex.
Kate's headline-making "no" to the peanut paste came as she and William made their official overseas humanitarian trip.
While in Copenhagen, the newlywed royals learned more about the situation in drought-stricken East Africa, toured the UN facility and even pitched in to help pack cardboard boxes of supplies.
While Kate's dietary choices may have indicated impending motherhood, her fashion choices on the trip did not.