Prince William and Kate Middleton have announced a due date for baby No. 3.

The British royals confirmed Tuesday through Kensington Palace that the pregnant 35-year-old Duchess of Cambridge is expected to give birth in April 2018.

"The Duke and Duchess of Cambridge are delighted to confirm they are expecting a baby in April 2018," Kensington Palace tweeted alongside a photo of the pair.

The announcement followed news Prince William and Middleton "will undertake an official visit to Norway and Sweden" in early 2018.

The trip was originally scheduled for November, but postponed due to Middleton's hyperemesis gravidarum, or severe morning sickness, according to the Daily Express.

Prince William and Middleton are already parents to 4-year-old son Prince George and 2-year-old daughter Princess Charlotte.

Kensington Palace announced in September that the couple are expecting their third child.

"Their royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting their third child," the palace said at the time.

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"The Queen and members of both families are delighted with the news."