The Royals ~

[Lady Cop]

London (CNN) -- Sons and daughters of British monarchs will have an equal right to the throne under changes to the United Kingdom's succession laws agreed to Friday, British Prime Minister David Cameron said.

The leaders of the 16 Commonwealth countries that have the queen as head of state approved the changes unanimously at a Commonwealth of Nations summit in Australia, he said. The individual governments of those 16 countries still must agree to the changes for them to take effect.

The constitutional changes would mean a first-born girl has precedence over a younger brother. They also mean that a future British monarch would be allowed to marry a Catholic.

The laws would apply to any future children of Prince William and Catherine, the Duchess of Cambridge, who married this year.