Auditions for the Role of Renesmee?

There is nothing confirmed, but according to Facebook's official modeling agency MMG Management, the casting director has already begun his search for Nessie.

Kayla D. (MMG's) of Montreal was called to be seen by the casting director of the Twilight Saga for the new movie BREAKING DAWN! Kayla is being considered to be the daughter of Edward and Bella (Robert Pattinson and Kristen Stewart). This is the first major audition for Kayla since she was discovered in July at IPOP!

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