Britain is anxiously expecting the arrival of the first child of Prince William and his wife, Kate.
"The last time I remember excitement like this was around the royal wedding," Getty Images Royal photographer Chris Jackson said. "I think this royal baby is going to trump all of that."
In following tradition, the palace press will alert the media only after the Dutchess of Cambridge has started labor.
Queen Elizabeth II said she hopes the baby arrives before she goes on vacation this weekend. Camilla, the Duchess of Cornwall, suggested the queen just might get her wish.
"We're all waiting at the end of a telephone," she said. "I think by the end of the week he or she will be there."