The Prince of Wales, who is self-isolating after testing positive for Covid-19, met the Queen two days ago in Windsor, the BBC reports.
They say the monarch is not showing any symptoms of coronavirus.
Prince Charles tested positive on Thursday morning – it is the second time he has contracted the virus.
The previous evening, he and the Duchess of Cornwall met Chancellor Rishi Sunak and others at a reception in the British Museum.
Camilla has tested negative for coronavirus, Clarence House said.
Buckingham Palace has not confirmed whether the Queen has tested positive or negative, citing medical privacy.
