Kate Middleton is awaiting the birth of her second royal baby and is now past her due date. Credit: Samir Hussein/WireImage.com

The clock is ticking! Kate Middleton is now four days past her due date, Us Weekly can confirm.

The Duchess of Cambridge, 33, was scheduled to welcome the second royal baby on Thursday, April 23, but the day came and went with no sign of another little one in sight. Although a Kensington Palace aide has told Us, "We have never commented on or discussed a due date," multiple other sources have confirmed the royal's due date.


A source also confirms to Us that senior members of the British Parliament were briefed with the due date of April 23, which is also being reported by The Telegraph

The pregnant beauty and her husband Prince William are awaiting the arrival of their second child, after previously welcoming the young Prince George on July 22, 2013. 

The future heir to the throne will soon become the older brother to a sister or a brother, as the palace has not confirmed the gender of the baby-to-be. As Us Weekly revealed last week, the Duke, 32, spent Wednesday, April 22, shopping for an entirely blue outfit, in what may be a sign that another prince is on the way. As seen with Prince George's arrival, the parents will make an official presentation of the baby, dressed in coordinating outfits outside the Lindo Wing at St. Mary's Hospital in London.

While she is now past her due date, Middleton, who also gave birth to Prince George a few days after his expected arrival, is comfortable and remaining positive, an insider told Us. 

"She's doing well, in good spirits," a source close to the Duchess said. "Everyone is! Although it would be fair to say she's also eager for the time to come."

Stay with Us Weekly for all the latest updates on Royal Baby number two, including an exclusive livestream of the scene outside St. Mary's Hospital once the Duchess goes into labor, frequent updates from royal experts and Us staffers in London, the big baby reveal, and much more!