Have no fear ladies! I too am an emotional person who happens to cry at anything. I was also affraid of having those sexy red blotches on my face, permenently captured in my wedding album.
But when it came down to the wedding day I was so relaxed that I wasn't in a crying mood. I cried when I fell down the stairs (before I started getting ready, phew). When it came to walking down the aisle, when I saw Steve I started to well up. I smiled and the tears went away. Just focus on smiliing and the tears won't be able to come.
On the flip side, if you're not able to smile through the tears, remember that photoshop can be a brides best friend. :-)