Kate Middleton wasn't born into the British royal family, but she has been given a role that demonstrates just how important she is to the House of Windsor.

Princess Kate has continued her gradual return to royal duty this year with a number of public engagements so far. After the Princess of Wales, 43, was diagnosed with cancer last year, she immediately took a break from royal work as she underwent chemotherapy and treatment.

The royal couple pause their Mustique getaway to announce their return to royal duties, reaffirming their commitment to public service.