BBC News viewers were greeted with an unusual studio visitor on Friday when the Queen appeared in the background on the live news channel behind two newsreaders.
The appearance happened as the Queen visited the rebuilt BBC Broadcasting House to officially declare it open. The revamp took a decade to complete and cost more than £1bn.
The Queen delivered a live broadcast on BBC Radio 4 during the visit, in which she said: "Thank you, director general. It is a great pleasure to visit the BBC today and to see it in its new home.
"I remember first coming to Broadcasting House with my father, the King, and my mother and sister shortly before the war. I came again with the Duke of Edinburgh shortly before the coronation in 1953.
"I hope this new building will serve you well for the future and I am delighted to declare it open today."
The monarch met BBC presenters David Dimbleby, Huw Edwards, Sophie Raworth and Sir Bruce Forsyth during a tour of the building and was treated to a live performance by band The Script, who played the David Bowie song Heroes.