Britain's Prince William and Kate, Duchess of Cambridge meet wheelchair basketball players, some of whom hope to compete in the 2022 Commonwealth Games, during their visit to the Copperbox Arena, London. Kensington Palace says Prince William's wife, the Duchess of Cambridge has entered a London hospital to give birth to the couple's third child. The former Kate Middleton travelled by car on Monday morning, April 23, 2018 to the private Lindo Wing of St. Mary's Hospital in central London. The palace says she was in the early stages of labour. Picture: AP

Catherine, the Duchess of Cambridge, has gone into labour.

The 36-year-old royal - who already has son Prince George, four, and daughter Princess Charlotte, two, with husband Prince William - was admitted to hospital on Monday morning in preparation for welcoming her third child into the world.

A statement released by Kensington Palace said: "Her Royal Highness The Duchess of Cambridge was admitted to St. Mary’s Hospital, Paddington, London earlier this morning in the early stages of labour.

"The Duchess travelled by car from Kensington Palace to the Lindo Wing at St. Mary’s Hospital with The Duke of Cambridge."

Catherine's younger sister Pippa Middleton is also reportedly expecting her first child with husband James Matthews. According to sources, she's due in October.