Kristen Stewart: Back to Work on "Breaking Dawn"

Back to her north of the border filming locale, Kristen Stewart was hard at work on the set of "Twilight: Breaking Dawn" in Vancouver on Monday (April 18).

The Bella Swan babe was dressed in blue as she also happened to be sporting a ring in which her character received from Robert Pattinson's Edward Cullen in the movie.

Also on location for the week-beginning shoot were Guri Weinberg and Noel Fisher - with the stars all rigged up in a device to replicate "vampire running."

A GossipCenter insider tells that security on the production was very tight with crew members holding up umbrellas to block the shots.

Enjoy the pictures from the set of "Twilight: Breaking Dawn" in Vancouver (April 18).