Britain's Royal Family has announced the Duke and Duchess of Cambridge are expecting their third child.
The official release from the palace said the Queen and members of both families were delighted with the news.
As with her previous pregnancies, the duchess is suffering from Hyperemesis Gravidarum, and will be cared for at Kensington Palace throughout her pregnancy.
Prince George and Princess Charlotte can expect a new brother or sister early next year.
The news might not surprise some close watchers of the pair.
Just last month speculation was rife that the Catherine was pregnant after she candidly mentioned having more babies during a royal outing in Poland.
The 35-year-old was given a gift for a newborn baby at the July event, where it was reported by the Daily Mirror she turned to William, also 35, and quipped, "We will just have to have more babies!"
Closer Weekly previously reported that she was rushed to hospital several weeks ago for an unknown reason, and was released the following day.
The Duchess gave birth to Princess Charlotte of Cambridge just two years ago, in May 2015, where she also suffered from Hyperemesis Gravidarum, which causes severe morning sickness.
She suffered from the condition with her first-born Prince George, too, and was admitted to hospital in December 2012 where she was diagnosed with the condition.
Prince George was born in July, 2013, and is due to start school on Thursday.
The Duke and Duchess of Cambridge were expected to drop him off, but it is now unclear if Kate will be able to attend.
Awareness of her tendency to the condition meant her second pregnancy was announced relatively early, rather than waiting for the 12-week milestone, as she cancelled public duties due to sickness.
The couple—and William's brother Prince Harry—just last week commemorated the twentieth anniversary of the death of Princess Diana, William and Harry's mother.
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Kate's last public engagement was last Wednesday, on the eve of Princess Diana's death, where the trio toured the garden at Kensington Palace, planted in memory of Diana.