If suspicions are true that they are breaking ties, the shock move raises questions over the funding of Harry and Meghan.
Currently, the costs of Harry's royal duties are covered by Charles.
Prince Charles pays for both William and Harry, and their spouses, from the income he receives from the Duchy of Cornwall, his hereditary estate which owns more than 131,000 acres across 23 counties, mostly in south-west England and in London.
The news comes after months of speculation surrounding a royal rift between Meghan and Harry, and Kate and William, which saw the Duke and Duchess of Sussex part ways with the Cambridges as they moved out of Kensington Palace and into their Frogmore Cottage home.
Lately, rumours have subsided as Meghan and Kate have been seen on various occasions enjoying days out together.