You can perform at the Grammys without a nomination but you have to be someone like Madonna or Adele. Generally, the spots are for nominees to perform the nominated song. There's absolutely no way Demi would get offered a spot to do the Grammys though
Lionheart is the best song on the album, don't fight me on this ... Facts are facts ! Stone Cold or Lionheart for 3 single and Kingdom Come or Old Ways for 4th perfect era.