The stars is a metaphor for fate, Divine Providence or even God. What it indicates is that Paul Rauch feels Manny is a great, complex couple, not the 'meet cute stuff of typical soap supercouples. What is in the stars is the breathtaking observation that it is so right, the stars had to be aligned just so -- two people who are so utterly perfect for each other, who seemed meant to be from birth, who you can't imagine with anybody else but ... but who were practically on the other sides of the world, suddenly are thrown together under such circumstances that you think Divine Povidence did lay a hand in it, knowing they were meant to be -- that's why I call them a God Match!
I think that's what they mean -- and the irony in Danny's wedding vows is that he was inadvertantly summing up exactly what was going down between him and Michelle -- he felt it was an interesting situation that just happened, but boy, he didn't know how wonderful it is that it did happen.
BettyM