At long last, Twilight fans can watch an extended sneak peek of Bella and Edward's wedding before The Twilight Saga: Breaking Dawn - Part I hits theaters November 18.

In the just-released trailer (above), Bella (Kristen Stewart) clutches her father's arm as she nervously prepares to walk down the aisle. "Don't let me fall," she warns.

After the outdoor ceremony, Bella's werewolf friend Jacob (Taylor Lautner) grows despondent when he realizes that his mortal pal will soon become a vampire like her husband (Robert Pattinson).

"This is how I'll remember you. Pink cheeks, heartbeat -- you think I'd be used to telling you goodbye by now," Jacob tells Bella.

Also in the trailer: Bella and Edward's bed-breaking sex scene, an epic showdown between the vampires and the wolves, and a preview of Bella in labor.

The Twilight Saga: Breaking Dawn - Part I arrives in theaters November 18.