Prince Harry and Meghan Markle are due to make their final public appearance as working members of the Royal Family.
The Duke and Duchess of Sussex will join Queen Elizabeth II and other royals at the Commonwealth Day Service at Westminster Abbey on March 9.
The royal couple has been carrying out a series of public appearances in the UK before stepping back as working royals.
They will gather with the Queen – who is head of the Commonwealth – the Prince of Wales, the Duchess of Cornwall and Prince William and Kate Middleton in the central London cathedral.
It will be the first time Prince Harry and Meghan have appeared with other members of the Royal Family since announcing their intention to “step back” as senior royals in January.
After the service, they are expected to return to their current base in Canada, where their son, Archie, has remained during the UK trip.
Prince Harry and Meghan Markle Will Step Back as Senior Royals and Work to Become Financially Independent
The couple are to begin their new life of personal independence, pursuing private commercial deals and charity projects.
Prince Harry and Meghan will retain use of Frogmore Cottage, in Windsor, and aides have said they will be in the UK regularly.
They will still attend some royal events but these will not be classed as official duties.
The new arrangements will be reviewed next year.
Prince Harry and Meghan have conducted a farewell tour of the UK with several appearances including the Endeavour Fund Awards and a military musical festival at the Royal Albert Hall.
Meghan Markle made a surprise visit to a school in Dagenham, east London, to celebrate International Women’s Day.
Meanwhile, Prince Harry joined Formula 1 driver Lewis Hamilton to visit a new motor racing museum at the Silverstone Circuit.
In stepping down as working royals, Prince Harry will relinquish his role as Commonwealth Youth Ambassador.
However, the duke will remain president of the Queen’s Commonwealth Trust and Meghan will still be the Trust’s vice-president.