Kate and William reveal they are expecting their third child as Duchess is forced to cancel public engagement after suffering from severe morning sickness

The Duchess of Cambridge (pictured left, and centre with William, on Wednesday) is pregnant with her third child - but has been forced to release the news early after being struck with severe morning sickness yet again. Kate, 35, battled Hyperemesis Gravidarum during her first two pregnancies and was hospitalised when expecting George in 2012. Today the Duchess was forced to miss her planned engagement at the Hornsey Road Children's Centre in London today, and is being cared for at Kensington Palace. The happy news that George, four, and Charlotte, two, will have a new sibling in April or May next year came later in a statement. The Queen was clearly delighted by the news as she opened the new Queensferry Crossing spanning the Firth of Forth today (right) while Prince Harry gave a thumbs up in Manchester and said he is 'very happy for them' adding his sister-in-law is 'doing ok'. It came after Kate hinted at a third child on a royal tour of Poland with her family in July (inset). She was given a cuddly toy meant for a newborn and said to William, laughing: 'We will just have to have more babies'.