I am one of three people in the US who has not read or seen anything Twilight, so you'll have to correct me if I get my facts wrong here.
First, Hallmark is selling the Swan/Cullen wedding invitations. You can personalize them to make them your own, but here's an example of THE invitation that the fictional characters sent out for their wedding.
It's...boring. Sorry. I don't get why you would send this as your invitation unless you just don't care.
In addition to the dull (opposite of sparkly, y/y?) wedding invitation, you can buy a lot of other Twilight stationery.
Mothers, if you get your teenage daughter this card, she'll feel like you finally understand her.
If you're looking for a wedding-day hair accessory that counts as something blue AND something pop-culture, you'll like this hair comb from Hot Topic.
I think it's pretty! I don't know if it looks cheap in real life, but it would look nice with a messy up-do.
If you really really want to emulate the Twilight wedding, you'll love this gown from Alfred Angelo.
I'd like it more if it had lace sleeves like Kate Middleton's gown. I think satin sleeves look like they don't fit right unless you get the impeccable tailoring.
Here's the trailer for the movie so you can see the really beautiful ceremony scene. I love all the white hanging flowers..
Serious question: does she EVER close her mouth? She's super pretty, but CLOSE THAT MOUTH.
If you spy any other Twilight-inspired wedding stuff, please let me know!