Hate to burst your love bubble, but there is no planetary alignment in 2012, let alone specifically on 12/21/2012. Hopefully you don't have to wait for one to find love, the next major alignment is in 2040.
Here's where the
outer planets will be on 12/21/2012. Here are the
inner planets.
Once the planetary alignment idea was destroyed (though apparently not for the movie) the thinking among those who take the doomsday stuff seriously shifted to that date being one on which earth will be aligned with the galactic plane (false, we're currently moving away from the plane) or that the solstice will align directly at the galactic center (essentially true, but true for the last 30 years and the next 30 years and entirely a visual artifact).
All of this, of course, ignores the fact that the Mayan calendar did not actually end on 12/21/2012 as archaeological artifacts include plenty of references to dates beyond that.