Kate Middleton
Kate Middleton is reportedly expecting twin girls.Getty

Kate Middleton is set to make her first public appearance since her second pregnancy was announced, Buckingham Palace has confirmed.

The Duchess of Cambridge, who is pregnant with her second child, has been suffering from a severe form of morning sickness - hyperemesis gravidarum - which she also experienced during the early stages of her first pregnancy. The illness affects one in 50 pregnancies.

Kate was forced to cancel a series of high profile royal engagements, including a state visit to Malta as a result of the condition, which was completed by Prince William instead. Kate also missed Prince Harry's successful Invictus Games.

The Palace has now confirmed that the Duchess is well enough to return to work.

Her first official engagement will see her formally welcome Singaporean president Tony Tan to Britain when he arrives in two weeks time, ahead of a four-day state visit.

The Duke and Duchess, who first met Mr Tan during a state visit to Singapore in September 2012, will greet the president and his wife Mary at the Royal Garden Hotel in London upon their arrival on the 21st October.

They are then due to travel with the presidential couple to Horse Guards Parade, where the pair will receive a formal ceremonial welcome from the Queen.

During the state visit, the couple will stay with the Queen and the Duke of Edinburgh at Buckingham Palace and will make a number of engagements around the UK, with trips to Bristol and Kew Gardens among those announced by the Palace.

Kensington Palace has said that while the Duchess is fully intending to attend the royal engagement, her appearances are being reviewed on a 'case by case' basis.

Kate is reportedly expecting twins.