The invitation for the 6 May coronation, printed on recycled paper, shows the coronation will mark a change in how Camilla is titled.
A royal source suggested that in the initial part of the new reign it made sense to use "Queen Consort" as a way of distinguishing her from the late Queen Elizabeth. But from the coronation it would be an "appropriate time" to officially change to "Queen Camilla".
At the coronation service next month, Camilla will be crowned alongside the King, 18 years after the couple married.