Kate already shares three children, Prince George, Princess Charlotte and Prince Louis with her husband Prince William.
If the couple were to add another bub to their brood the royal tot would be the sixth in line to the throne.
And, given that the Duke and Duchess of Sussex, Meghan and Harry, are due to welcome their first child in the next few months, this means that royal fans could get two royal babies this year.
"The odds of Kate and Wills sharing some good news soon have taken another plunge,” a bookmakers.tv spokesperson told The Sun.
“The latest betting definitely suggests there could be an announcement around the corner and when it comes bookies should brace themselves for the biggest royal betting frenzy of all time.”