Queen Elizabeth II shown around \'Back to Nature\' by Prince William and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019.

Queen Elizabeth II shown around 'Back to Nature' by Prince William and Catherine, Duchess of Cambridge at the RHS Chelsea Flower Show 2019.Getty

As Prince William's wife, Kate Middleton's title as Duchess of Cambridge will automatically change when Queen Elizabeth II either dies or steps down and Prince Charles becomes king. 

Prince William is second in line to the throne, and as rumours circulate that Queen Elizabeth is expected to hand over the crown to her son Prince Charles within the next two years, we can't help but wonder what does this mean for Kate Middleton?

Read more: Kate Is Now A Dame Grand Cross of the Royal Victorian Order. What's that?

Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace.

Catherine, Duchess of Cambridge visits the Hampton Court Flower Festival with children from Hampton Hill junior school at Hampton Court Palace.

Currently known as the Duchess of Cambridge, when William becomes next in line to the throne, his title will automatically change to Prince of Wales, the title historically held by those first in line. In fact, this title was officially granted to Prince Charles at his investiture 50 years ago, and he's the 21st man to hold the title.

When Charles married Diana Spencer in 1981, she automatically became Princess of Wales. And while technically the title should have passed to Camilla Parker Bowles upon her wedding to Charles, she turned it down out of respect to Diana and is instead known as the Duchess of Cornwall. 

Read more: Everything you need to know about Camilla, Duchess of Cornwall

However, when Charles ascends the throne, the Duchess of Cambridge is expected to accept this title in honour of Prince William's mother.

* Originally published in July 2019.