Almost two months after we learned a third royal baby was on the way, Kensington Palace has officially confirmed when we will meet our next little Prince or Princess.

Sharing the announcement on Twitter, the Palace confirmed Prince William and the Duchess of Cambridge are expecting baby number three to arrive in April 2018.

The Duke and Duchess of Cambridge are delighted to confirm they are expecting a baby in April 2018. pic.twitter.com/jOzB1TJMof

— Kensington Palace (@KensingtonRoyal) October 17, 2017

Besides the fact that their family will now be one of five, the due date holds a special significance for Kate and Wills – they were married on April 29, 2011.

It’s also the same month Queen Elizabeth II will celebrate her 92nd birthday, and just one month later that the date Princess Charlotte was born.

The next royal baby will be born just one month after big sister Princess Charlotte..

As with her first two pregnancies, the 35-year-old has been suffering from Hyperemesis Gravidarum, a form of severe morning sickness, since learning she was expecting.

It wasn't until last week that the public got their first glimpse of the pregnant Duchess of Cambridge, who had not being attending public engagements while she sought treatment. She was even forced to miss Prince George's (adorable) first day of school.

To see Kate Middleton's maternity style CLICK THROUGH the gallery. Post continues...

Kate names the Clore Art Room at Barlby Primary School.

Kate meeting the kids.

The bump.

The Bump again.

Kate and Will on Christmas Day.

Kate wearing a hoody.

Kate and Will in the US.

Kate and Will in the US.

The Duke And Duchess Of Cambridge Visit The National September 11 Memorial Museum

Looking always stylish.

Posing for a photo after the game.

Kate and Will

Kate visits Northside Center For Child Development.

Kate and William arrive in New York.

Meeting some of her younger fans.

The Duchess Of Cambridge Attends East Anglia's Children's Hospices Appeal Launch.

More little fans.

Kate Middleton

The Duchess Of Cambridge Attends A SportsAid Athelete Workshop

The Duchess Of Cambridge Attends A SportsAid Athelete Workshop.

The Duchess Of Cambridge Attends A SportsAid Athelete Workshop

Kate at a remembrance day service