Catherine, Duchess of Cambridge (commonly referred to by her maiden name Kate Middleton by the press) entered St. Mary's hospital at 6:00 am Monday London Time.
"Her Royal Highness The Duchess of Cambridge has been admitted this morning to St. Mary's Hospital, Paddington, London in the early stages of labour," an official statement from Kensington Palace read. "The Duchess traveled by car from Kensington Palace to the Lindo Wing at St. Mary's Hospital with The Duke of Cambridge."
Kensington Palace is the official home of Kate and her husband, Prince William. William accompanied his wife to St. Mary's. It's the same hospital where the late Diana, Princess of Wales, gave birth to both William and his brother Prince Harry.
Once the royal baby is born, a wooden easel with its time of birth, gender and weight will be displayed outside Buckingham Palace, followed by an electronic announcement.
It will be the first child for the Duke and Duchess of Cambridge, and Queen Elizabeth II's third great-grandchild. The baby will be third in the line of succession, behind Prince Charles and Prince William.