Prince William is training for his Bond Air Services job with the East Anglian Air Ambulance. According to Maclean, this is the first time a royal has worked for a private company. (The Duke's $80,000 salary will be donated to charity). Training is based in Cambridge, Norwich, and Staverton, but a source told Us Weekly that the prince will "never be more than a couple hours drive from London."

Another absent prince: Prince George. The third in line to the throne might not be taken to the hospital for the photo reveal of his new sibling.

"Like last time, the Duke and Duchess do not know if the baby will be a boy or a girl," the source told Us Weekly, with another source adding, "The Duke and Duchess don't plan to take on any additional child care."

The Duchess of Cambridge is expected to receive her medical care from Dr. Guy Calthorpe Easton in the Lindo Wing, according to Us Weekly. All announcements of the birth, gender and name will be made on Twitter, as the modern couple did for their son, according to Vanity Fair. The easel outside Buckingham Palace will also be used, but without the ceremony involved for the birth announcement of Prince George.

"The Duke and Duchess are hugely grateful for the warm wishes they have received from people throughout the UK and indeed round the world over the last few months," a senior Kensington Palace source told Us Weekly. "They know that people are excited that Prince George will soon have a brother or sister and it means a great deal to them that so many will be celebrating this important moment for their family."