The Duchess of Cambridge is pregnant with her second child, Clarence House announced earlier today.
The Duchess, 32, is already mother to Prince George, who was born in July last year.
It was confirmed that she is currently being treated for severe morning sickness by doctors at Kensington Palace, as with her previous pregnancy.
The couple have both mentioned their wish to extend their family further, with speculation rising when they toured Australia earlier this year with their son and suggested to fans that they may be considering having a sibling for Prince George in the near-future.
Prince William and his wife both have close ties with Cambridge, after being given the title of Duke and Duchess of Cambridge by the Queen after their wedding in 2011.
The Duke and Duchess also visited Cambridge for the first time together in 2011, and they have retained close links with the city.
The Duke completed a ten-week course in agricultural management at Cambridge University earlier this year, and it is now expected that he and Duchess will remain close to Cambridge, splitting their time between Kensington Palace and the Norfolk countryside while William continues his work as an pilot with the East Anglian air ambulance service.
Cambridge students are delighted at the news. Sarah Thomas, a third year English literature student, said "It's fantastic news for the Duke and Duchess of Cambridge. Cambridge students already see the couple and Prince George as our Royals, now we'll have another Royal!"