Mathieu sang at the London Palladium during royal performances (before the Queen and her family), first in 1967, with further performances in 1969 and 1981. 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 earlier. She also toured Canada and the United States, where she appeared on The Ed Sullivan Show and the Danny Kaye Show. While visiting Hollywood, she met Elvis Presley, and in Las Vegas, Nevada, she sang with Dean Martin and Frank Sinatra.
Mathieu sang at the London Palladium during royal performances (before the Queen and her family), first in 1967, with further performances in 1969 and 1981. Following her second performance, her French cover of Engelbert Humperdinck's "The Last Waltz" (La dernière valse) generated mu.ch publicity in Great Britain and became a hit record, even though the original had been number one only a few months earlier She also toured Canada and the United, States, where she appeared on The Ed Sullivan Show and the Danny Kaye Show. While visiting Hollywood, she met Elvis Presley and in Las Vegas, Nevada, she sang with Dean Martin and Frank Sinatra.