The sweet way Meghan Markle channelled Princess Diana during her final royal appearance

Last week Prince Harry and Meghan Markle stepped out in London for their final royal engagement as senior members of the British royal family.

As the couple joined the Queen at the Commonwealth Day service at Westminster Abbey, all eyes were on the Duchess of Sussex who looked a picture of elegance in a form-fitting emerald-green cape dress from Kiwi designer Emilia Wickstead with a matching William Chambers fascinator.

To finish off her eye-catching look the 38-year-old former actress accessorised with nude stiletto pumps by Aquazzura and a chic mini bag by Gabriela Hearst.

For her final royal look - the bold jewel tone ensemble - the mum-of-one channelled her late mother-in-law, Princess Diana.

Back in 1982, the "People's Princess" wore an all-green shirtdress and tulle-bowed hat for the traditional royal Trooping the Colour ceremony.

At the time Diana was just 22-years-old and pregnant with her first son, Prince William.

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The service marked the last joint appearance the Duke and Duchess of Sussex would be making before starting fresh in Canada, where they aim to become "financially independent".

It was also the first time Meghan and Harry have reunited with Prince William and Kate Middleton since their decision was announced, amid long-running reports of a family feud.

The Sussexes will close their Buckingham Palace office on April 1 before heading back to Canada, where they wish to raise Archie away from the spotlight.

Within the next few weeks, a new title for their official Instagram account and their upcoming nonprofit organisation is expected to be announced.