The Duke and Duchess of Cambridge are expecting their second child together.
Clarence House confirmed the news on Twitter this morning, adding that the Queen and both families are delighted with the news.
The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting their second child
— Clarence House (@ClarenceHouse) September 8, 2014
The Queen and members of both families are delighted with the news that Their Royal Highnesses are expecting their second child
— Clarence House (@ClarenceHouse) September 8, 2014
Prince William and Kate are already parents to a son, Prince George, who celebrated his first birthday earlier this year.
According to BBC News, the duchess is suffering from acute morning sickness as she did during her first pregnancy. She is being treated by doctors at Kensington Palace.

The Duke and Duchess of Cambridge with their son George.
David Cameron has already tweeted his congratulations to the couple, who got married back in 2011. He wrote: “Many congratulations to the Duke and Duchess of Cambridge. I am delighted by the happy news that they’re expecting another baby.”
Kate, who has been surrounded by pregnancy rumours in recent months, will now no longer accompany her husband during a planned engagement in Oxford on Monday.

Kate has been surrounded by pregnancy rumours in recent months.