Former royal butler Paul Burrell claims the Royal Family's future "rests on" Princess Kate.

Burrell stated that Kate holds the same role as Princess Diana as the future queen.

The future of the monarchy is down to Kate, and the royal family would collapse if she decided to leave her marriage.

Kate joined Prince William and senior members of the Royal Family for a royal engagement on Commonwealth Day.

Judi James, a body language specialist, says Kate and William had "flirtatious" moments during the service.

Kate was bestowed the Princess of Wales title, previously held by Diana, in September.

Upon ascending the throne, the King granted Prince William the title of Prince of Wales.

Despite occasionally attending royal engagements with their children, Kate and William spent Commonwealth Day alone.

The couple also shares Prince Louis, who will turn five next month.