Instead, Prince William could be set to fill in and walk her down the aisle - despite Markle reportedly preferring for her mum to give her away.
Meghan teamed her coat with a stylish hat by Stephen Jones.
This story first appeared in The Sun and is republished with permission.
After hearing about 10-year-old Sophia Richards' aspirations, Prince Harry directed her to his fiancée in an instant, and of course, Meghan was only too happy to offer advice as well as a warm hug.
He said: "We hope the younger royals like William, Catherine, Harry and Meghan will recognise the vast persecution suffered by LGBT people in the Commonwealth and speak out as they have on many social issues".
But the Duke of Edinburgh, who has effectively retired from public duties, will not be attending.
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The prince said they looked forward to travelling around the Commonwealth, meeting some of the 2.4 billion people from the 53 member states.
These events come ahead of two extra special dates in the Royal family - the birth of William and Kate's third child in April and the wedding of Meghan and Harry on May 19.
The Commonwealth Service is the largest inter-faith gathering in the United Kingdom and is now being televised on the BBC. Prince Andrew, Princess Anne and the Countess of Wessex also made up the royal party.
London will soon host a gathering of leaders from the family of nations and the Queen, who is head of the Commonwealth, also paid tribute to the biennial event as an example of how consensus can "help to create a future that is fairer, more secure, more prosperous and sustainable". Around 2,000 people sat in the congregation including Prime Minister Teresa May, senior politicians from across the United Kingdom and Commonwealth, and over 800 school children and young people.
Later on Monday, Prince Charles and Camilla and Prince William will be guests of the Commonwealth Secretary-General, Rt Hon Patricia Scotland QC, at the annual reception held at Marlborough House, the home of the Commonwealth Secretariat.