They are both superstars, but when comes the time of the Grammy Awards next Sunday, Miley Cyrus and Taylor will be set for a sensational duet..According to some reports, the star of Hannah Montana and the singer of "Should've Said No" would be working on a new and improved version of the song "15" by Taylor.Taylor told Ryan Seacrest, "The texts are exciting. Many girls are inspired by us, and in this song is us that we give our advice ... The song is perfect for the Grammy.