Not realising she had singled out a British royal, Beyonce tried to get Eugenie to take part, even miming the words, To the left, to the left to encourage her to sing.
It was hilarious, an concert-goer told the Mirror. Eugenie was on the front row with Kate Middletons brother James, and his new girlfriend, Donna Air, plus designers Matthew Williamson and Patrick Cox.
When Eugenie, who had gone bright-red, ducked down, Beyonce was forced to quickly fill in the missing words and find a new, willing victim.
All Eugenies friends were teasing her about her stage fright for hours afterwards.
