From babble.com
Finally, in “Breaking Dawn” the fourth Twilight movie and book, Twilight fans get the wedding they have been waiting for for: Edward and Bella get married. Played by real-life couple Robert Pattinson and Kristen Stewart, Twilight fans get their romantic moment.

But, David Slade, the director of the “Twilight Saga: Eclipse” says that the wedding is probably going to be in the movie sooner than fans of the book would expect.

It takes until chapter three of the “Breaking Dawn” book version for Edward and Bella to get married. But, it might have come earlier in the film version.

They even considered having the wedding be in the third move instead, as a way to end “Twilight: Eclipse.”
Twilight fans, will you be disappointed if the opening scene of the first “Breaking Dawn” film is Edward and Bella’s wedding? Do we need to have a short introduction before the wedding occurs or is it okay to leave that part of the story out? After all, book four is long: even though it will be made into two movies, there is still a lot of ground to cover.

via Twilightish
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