The pregnant Duchess of Sussex today look radiant in an emerald green coat dress as she arrived with Prince Harry for a Commonwealth Day youth event in London.

Meghan and Harry were attending an event at Canada House on Monday showcasing the diverse community of young Canadians living in the UK.

It marks the duchess' first engagement since being named vice-president of the Queen's Commonwealth Trust on Friday, International Women's Day.

Meghan will now help highlight the body's work with young people across the Commonwealth, particularly supporting women and girls.

The royal couple will later join the Queen at the Commonwealth Day service along with senior members of the royal family and leading figures from national life.

The duchess wore a dark green coat dress by Canadanian-Turkish designer Erdem over her blossoming baby bump, along with black stiletto heels.

Meghan is due to give birth to her first child in spring.

Commonwealth Day has a special significance this year, as 2019 marks the 70th anniversary of the modern Commonwealth - a global network of 53 countries and almost 2.4 billion people.

The theme for this year's service is "A Connected Commonwealth" which highlights the co-operation between the culturally diverse family of nations who work together in friendship.

Highlights of the service include performances by Grammy-winning group Clean Bandit and tenor Alfie Boe.

A reflection will be given by Lewis Pugh, an endurance swimmer, ocean advocate and the UN Patron of the Oceans.

The Prince of Wales, Duchess of Cornwall, Duke and Duchess of Cambridge and the Duke of York will also attend the service.

Other guests among the 2,000-strong congregation will include Prime Minister Theresa May, the Commonwealth Secretary-General Baroness Scotland, alongside high commissioners, ambassadors, faith leaders and more than 800 schoolchildren and young people.

Later in the evening, Charles and Camilla will be guests of the Commonwealth Secretary-General at the annual reception which traditionally takes place on Commonwealth Day at Marlborough House, the home of the Commonwealth Secretariat, the institution's civil service.

In her message to mark Commonwealth Day, the head of state has praised how the family of nations inspires its member states to find ways of protecting the planet and its citizens.

Millions of people are "drawn together" because of the collective values shared by the institution, the Queen says in her address to the 53 countries of the Commonwealth.

The written message is featured in the order of service for the annual Commonwealth Day service being held at Westminster Abbey.

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The Queen, who is head of the Commonwealth, says in her message: "In April last year, I welcomed the leaders of our 53 nations to Buckingham Palace and Windsor Castle for the Commonwealth Heads of Government Meeting, and we all witnessed how the Commonwealth vision offers hope, and inspires us to find ways of protecting our planet, and our people.

"We are able to look to the future with greater confidence and optimism as a result of the links that we share, and thanks to the networks of co-operation and mutual support to which we contribute, and on which we draw.

"With enduring commitment through times of great change, successive generations have demonstrated that whilst the goodwill for which the Commonwealth is renowned may be intangible, its impact is very real."

Later in the evening, Charles and Camilla will be guests of the Commonwealth Secretary-General at the annual reception which traditionally takes place on Commonwealth Day at Marlborough House, the home of the Commonwealth Secretariat, the institution's civil service.

Additional reporting by Press Association.