The 37-year-old "Yeah!" hitmaker, who was on "The Ellen DeGeneres Show," said they tied the knot during their visit to Cuba, reported Female First.
"Thank you! (We married) in Cuba - it was really great," he said.
Usher said he and Miguel had wed in Cuba, but shared little else about their secret nuptials - except to dismiss the Instagram pics as proof they were husband and wife.
You know what's funny? We put this picture up and we were actually just in Cuba on a cultural exchange and people were like, 'Hey, they got married.; But you know, the ring is on the other finger, you guys. But we had a great time. (Grace is a) wonderful woman," he said.
"Buffering.The clock is ticking... It's coming next year. Definitely next year," he said.
Usher's last album was "Looking 4 Myself," that released in 2012.