When you're Simon Cowell, you don't shop for wedding bands out of a circular -- you pick the biggest acts in the world, who probably owe you a favor or two, and get them to belt out the hits. According to sources close to Simon, Sir Elton John is one of his top picks. Maybe he'll bring along Lady Gaga or Eminem for one of his famous duets! Scoop on Simon's nuptials and more after the jump!