Last week, 70-year-old John announced details of a three-year world tour that he says will be his last.
Plenty of fire and fury at 60th annual Grammy Awards →
"We had John Legend as one of the artists in 2006 in the beginning of his career, and that was a very good experience. Since then he has had an amazing career. Therefore, we have over the years discussed inviting him back," he said.
John Legend on fatherhood: 'You want people to have justice' →