The 67-year-old star got angry when the first half of her production The Audience was interrupted by a band of 25 drummers playing outside the Gielgud Theatre, reported Daily Star.
Explaining the incident, she said, "I'm afraid there were a few 'thespian' words used. They got a very stern royal ticking off but I have to say they were very sweet and they stopped immediately.
"I would love to track them down and invite them to see the play. I felt rotten but on the other hand they were destroying our performance so something had to be done. The drumming just slowly got louder and louder and then settled right outside the stage door.
"There was just a thin wall between drumming and the theatre so it was unbelievably loud on stage. (Co-star) Paul Ritter and I could hardly hear each other speak and the audience couldn't hear us speak at all," she added. The actress apologised to the audience for the disruption, and was given a standing ovation for her foul-mouthed rant.