The Royal family is "waiting for the phone call" that the Duchess of Cambridge has given birth, Prince Charles' wife says.
Amanda Love, wife of the deputy chairman of the Ritz hotel, said to the Duchess of Cornwall: "I bet you are on tenterhooks waiting for the birth."
Camilla replied: "Yes, we are very excited - immensely looking forward to it and waiting for the phone call", according to the UK's Daily Telegraph.
Catherine is said to be doing well, while her husband, Prince William is in Wales, where his Royal Air Force Search and Rescue squadron is stationed.
He has a helicopter on standby so he can fly to London for the birth.
The Duchess is sticking to tradition giving birth in the private Lindo wing of St Mary's hospital in Paddington, where Princes William and Harry were both born.
The Queen's former gynaecologist Marcus Setchell has postponed his retirement for the Royal delivery.
Dr Setchell was on hand to look after Catherine when she was admitted to hospital suffering from hyperemesis gravidarum or severe morning sickness in December.
The world's media earlier set up camp around the hospital, determined to capture the mother-to-be as she enters the grounds.
The Duchess hasn't been seen in public since June when she joined the Royal family to celebrate the Queen's official birthday.