Mireille sang twice at the London Palladium during royal performances (before the Queen and her family). Once in 1967, and again in 1969. Following her second performance, her French cover of Engelbert Humperdinck's "The Last Waltz" (La dernière valse) generated much publicity in Great Britain and became a hit record even though the original had been number one only a few months previously. She also toured Canada and the United States, where she appeared on The Ed Sullivan Show and the Danny Kaye Show. While on a visit to Hollywood, she met Elvis Presley, and in Las Vegas, Nevada sang with Dean Martin and Frank Sinatra.