The Twilight Saga: Eclipse has been filming for months now — but the casting isn't over yet!

Kyle XY star Kirsten Prout has been confirmed to play Lucy, who is part of the past of Jasper Cullen (Jackson Rathbone) and is instrumental in helping create a vampire army. Boy, that's a change from playing mysterious Kyle XY's piano-playing girl-next-door GF.

And 14-year-old Jodelle Ferland is also joining the cast as Bree, a young vampire.

What do you think of Kirsten playing Lucy?

Kirsten played Matt Dallas' girlfriend on ABC Family's Kyle XY.

Photos: Courtesy of ABC Family

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