The new was confirmed in a press release sent out by Kensington Palace on Monday morning.
"The Queen and members of both families are delighted with the news," the statement continued.
Princess Catherine is, as with her first two pregnancies, suffering from a condition known as Hyperemesis Gravidarum – an acute version of morning sickness. She cancelled an engagement originally planned for the day of the announcement.
The Duke and Duchess had their first child, Prince George, on 22 July 2013. The four-year-old prince has just started school.
The couple's second child, Princess Charlotte, was born on 2 May 2015.
Messages of congratulation quickly began flying in across social media:
-
'I have lost a treasure, such a sister, such a friend as never can have been surpassed': Inside Jane Austen's Winchester home, the house where she penned her final words and drew her final breathJane Austen spent the last days of her life in rented lodgings in Winchester, Hampshire. Adam Rattray describes the remarkable recent discoveries made about the house in which she died.
-
An utterly charming island home in Scotland with gardens so beautiful they made the cover of Country LifeAn Cala on the Isle of Seil has a fascinating history that is only enhanced by its amazing setting.
-
The greatest moment in the life of Jessie Owens: Country Life Quiz of the Day, June 13, 2025Breathtaking athleticism and Shakespeare's birthday are among the questions in the final quiz of the week.
-
The deaths of Romeo and Juliet: Country Life Quiz of the Day, June 12, 2025A Rolling Stone and a familiar-sounding place find their way into Wednesday's Quiz of the Day.
-
England's answer to New York: Country Life Quiz of the Day, June 11, 2025A Rolling Stone and a familiar-sounding place find their way into Wednesday's Quiz of the Day.
-
David Beckham to guest edit Country Life'I am looking forward to celebrating what the countryside means to me and my family,' says David Beckham as he gets ready to edit Country Life's issue of October 22, 2025.
-
Tulip-mania, Travolta v Hanks and the worst-named castle in Britain: Country Life Quiz of the Day, June 10, 2025Tuesday's Quiz of the Day tests your spelling, and ponders kings without facial hair.
-
Country Life 11 June 2025Country Life 11 June 2025 is our Best of Britain special issue, celebrating the places, people, plants and craftsmen that make this country great.
-
Castles, candles and cards: Country Life Quiz of the Day, June 9, 2025Poker hands, pithy quotes and unusual pets feature in Monday's Quiz of the Day.
-
Country Life 4 June 2025Country Life 4 June 2025 is a celebration of the best of Hampshire, from Jane Austen's cottage to the winding streets of Winchester.
