Kate Middleton, formally known as the Duchess of Cambridge, sparked pregnancy rumors during an appearance in Denmark this week, after turning down peanut paste.
Pregnant women are urged to avoid peanuts and their bi-products to avoid possible allergies. Middleton declined the peanut paste when she and Prince William visited a United Nations aid depot in Copenhagen on Wednesday.
William and their hosts, the Danish Crown Prince Frederik and his wife Crown Princess Mary, tried the paste, which is part of UNICEF's packages which are brought to areas suffering from famine.
ABC News reports that Middleton gave her husband a knowing look as he read the product's label.
The palace also offered a rare comment on the incident The Sun reports, "Her spokesman went out of their way to stress that she has no nut allergy whatsoever."
Also fueling the rumor is the fact that British parliament recently changed the country's succession law to allow females to become the head of the monarchy. The previous rule had been in place for over 300 years.
If the 29-year-old royal is pregnant and has a daughter, she could be queen of England.
Last month it was announced that Prince William and Kate are planning to open a children's cancer center at a hospital in their native United Kingdom.
William, the 29-year-old Duke of Cambridge, is the president of the Royal Marsden Hospital's NHS Foundation Trust. He and Kate will open the facility's new Oak Centre for Children and Young People on September 29, his office said in a statement.
The move comes amid reports that say that the 29-year-old Duchess of Cambridge has been researching potential charities to support formally. She appears to be following in the footsteps of her late mother-in-law, Princess Diana, who was known for her global humanitarian efforts.
William married Kate Middleton in London on April 29 in a ceremony watched by millions of people around the world, including more than 22 million viewers in the United States.