Well, they've not got an exact date as yet, but only mother nature (or someone proficient in administering the C Section) can know these things. Exact date aside, the Royal baby is due in July.
Prince William and Duchess Catherine have so far kept quiet on their due date but a royal spokesperson has now confirmed they will welcome a new addition to their family in the middle of the summer.
A St James's Palace moufpiece said: "Their Royal Highnesses the Duke and Duchess of Cambridge are delighted to confirm they are expecting a baby in July. The duchess' condition continues to improve since her stay in hospital last month."
The couple - who married in April 2011 - announced they were expecting their first child together at the beginning of December after the duchess was admitted to the King Edward VII Hospital in London after suffering from acute morning sickness.
The Duchess formally known as Kate has rarely been seen out in public since being released from hospital as sources say she wants to keep a relatively low profile - apart from this very covert foray on the telly with Bradley Wiggins and David Beckham.
The 31-year-old beauty did go to the National Portrait Gallery last Friday (11.01.13), where she and William were given an exclusive view of her first official portrait. Back to the drawing board, me thinks.