Susan Boyle will sing for Pope Benedict at a massive outdoor mass in Glasgow later this year in September.
Catholic Church leaders have asked the 'Britain's Got Talent' star to perform before a crowd of 150,000.
A senior church source stated: "Susan has agreed to sing and everyone is delighted. It is a done deal.
"There are still some of the finer details to be ironed out but it has been approved by the highest echelons in the Vatican.
"Susan has described it as a dream come true and it will be an extra attraction for everyone attending."
A spokesman for the Catholic Church stated: "We would be delighted if Susan Boyle was to perform on the day at Bellahouston Park. She is top of our wish list."
Pope Benedict XVI will visit Edinburgh and Glasgow at the start of his four-day tour of the UK from September 16-19.
It is now nearly thirty years since the last papal visit to Scotland, when Pope John Paul II celebrated mass at Bellahouston Park on June 1, 1982, in front of 300,000 worshippers.
Susan's album 'I Dreamed a Dream' has sold over ten million copies. The Catholic Celtic supporter has described the notion of singing for the pope as one of the most exciting moments of her life.
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