Royal Family Makes a Big Announcement

LONDON (TheBlaze/AP) — If you've noticed that the Duchess of Cambridge, wife of Prince William, has been out of the lime light within the last month, it's because she's being treated for severe morning sickness accompanying her second pregnancy, which was formally announced Monday.

The couple's Clarence House office said they and their families were "delighted" with the new baby news.

In this Tuesday, July 23, 2013 file photo, Britain's Prince William, right, and Kate, Duchess of Cambridge hold George, the Prince of Cambridge, as they pose for the media outside St. Mary's Hospital's exclusive Lindo Wing in London where the Duchess gave birth on Monday, July 22. The Duchess of Cambridge, wife of Prince William, is expecting her second child and was being treated for severe morning sickness, royal officials said Monday, Sept. 8, 2014. (AP Photo/Kirsty Wigglesworth)

The former Kate Middleton was being treated at Kensington Palace for severe morning sickness, Clarence House said.

She was hospitalized for the same condition, hyperemesis gravidarum, during her first pregnancy with Prince George, who was born in July 2013.

Britain's Prince WiIliam, the Duke of Cambridge, (L) poses for pictures with his wife Catherine, Duchess of Cambridge, as they leave the King Edward VII hospital in central London, on December 6, 2012. Prince William's pregnant wife Catherine left a London hospital on Thursday, four days after she was admitted for treatment for acute morning sickness. (LEON NEAL/AFP/Getty Images)

The illness means the 32-year-old duchess may need extra hydration, medication and nutrients.

Watch this report from the Associated Press about the duchess' pregnancy announcement:

British Prime Minister David Cameron said he was "delighted by the happy news that they're expecting another baby."

Kate, the Duchess of Cambridge, and her husband Prince William as they give their son Prince George a stuffed toy of Australian animal called a Bilby, which has been named after the young prince, during a visit to Sydney's Taronga Zoo, Australia. Prince George turns 1 on Tuesday. While he may be too young to appreciate it, the milestone is causing a nationwide frenzy. Editorial writers call him a symbol of hope, newspaper headlines hail him as "Gorgeous George" and one published a 24-page glossy magazine chronicling his first 12 months. (AP/David Gray, Pool)

The new baby will become fourth in line to the throne, pushing Prince Harry to fifth. Toddler Prince George is third and likely to become Britain's monarch one day.