The expectant mum "is ready to go," a friend tells PEOPLE
Credit: Beretta/Sims/Rex

Princess Kate is tired of waiting, too.

The expectant mum, who has passed her late-April due date, “is ready to go,” a friend tells PEOPLE.

But even as the world grows increasingly impatient – and more than a little mad, judging by the scene outside the "Limbo" Wing – Kate remains her usual keep-calm-and-carry-on self, says the friend.

“She looks great and she has seemed completely chilled out about it all,” says the pal.

Still, she’s not in a bubble when it comes to the mounting frenzy surrounding the arrival of her second child.

Like her husband Prince William, she reads the news both online and in the papers – with much of the current coverage centered on every last detail about her upcoming delivery.

“She’ll be thinking, ‘Leave me alone, the baby will come when it comes!’ ” says the pal.

Keep reading for more on the royal baby.

The Latest from the Scene of the #GreatKateWait