The Sun report that the 50-year-old singer will be the headline act at the Royal Windsor Horse Show this summer.
Other stars set to perform include Welsh opera star Katherine Jenkins, Il Divo and Canadian crooner Michael Buble.
"This show will be a major highlight of the Queen's Diamond Jubilee celebrations," a source told the newspaper. "Susan is a huge global star and it's a great booking for such a prestigious event."
The performances will take place in May and air on ITV1.