Dame Helen Mirren felt mortified for losing her temper at a group of street performers in London on Saturday (04May13) after realising onlookers were filming her outburst on their camera phones.
The actress stormed out of the Gielgud Theatre during the interval of The Audience to berate a group of 25 drummers for playing outside the venue and interrupting her play, in which she plays Britain's Queen Elizabeth Ii.
But the 67-year-old star admits she got so carried away with her furious rant, she hadn't noticed she was being filmed.
She tells Britain's The Sun, "I walked off stage in full costume and make-up, straight out the stage door and just said, 'You're f**king up our performance. Please stop, please stop.' I've never done anything like that before, but I'd do it every night if there were people drumming outside the theatre.
"I went and did my number, and then I looked around and all these people were recording it on their phones. I thought, 'Oh my God, what have I done?'"
Dame Helen has since made amends with organisers of the group, who were promoting the As One In The Park gay pride festival, by wearing a T-shirt emblazoned with the organisation's name.
She adds, "I'd love them to see the play and understand why I was so upset. I felt terrible - they are fellow performers."