The Duke and Duchess of Cambridge announced tonight their baby son would be called George Alexander Louis.

William and Kate's baby will be known as Prince George and as third in line to the throne will one day be king.

Kensington Palace said in a short statement: "The Duke and Duchess of Cambridge are delighted to announce that they have named their son George Alexander Louis.

"The baby will be known as His Royal Highness Prince George of Cambridge.’’

The Duke and Duchess had been expected to pick a traditional royal name for their newborn.

Royal infants usually have historical names which are passed down through the generations.

George had been the most popular name with betting firms William Hill, Coral and Paddy Power.

Six King Georges have worn the crown throughout history since the German-born George I, the first Hanoverian king of Great Britain, acceded to the throne in 1714.