Prince William, his wife Kate and their new son are about to leave hospital, Kensington Palace says.

From there, they will travel back home to Kensington Palace.

"Her Royal Highness The Duchess of Cambridge will be discharged this evening from St Mary's Hospital, Paddington," the palace said in a statement on Tuesday.

"The Duke and Duchess of Cambridge and their son will travel home to Kensington Palace.

"Their Royal Highnesses would like to reiterate their thanks to the hospital for the care and treatment they have all received."