Now we know when Prince William and Duchess Kate are expecting baby number 3.

Kensington Palace tweeted that the Duke and Duchess of Cambridge are delighted to confirm they are expecting a baby in April 2018.

Back on September 4 the palace said in a statement that the couple is expecting their 3rd child and the Queen and members of both families were delighted with the news.

Kate initially planned to keep the news under wraps for a little while longer, but since she was suffering from the same acute morning sickness she experienced while pregnant with Prince George, she was forced to go public sooner.

A source told Us Weekly in September Will and Kate had known about the pregnancy for a while and they didn’t want to announce it before the 12-week mark… but due to having to cancel an engagement, they thought it was best to be honest about the situation.

Just a day before, Kate went to a charity event and danced with Paddington Bear.