'Twilight: Breaking Dawn' adds 'Lost's' Maggie Grace to its cast

maggie-grace-getty.jpgFormer "Lost" star Maggie Grace will sink her teeth into the final installments of the "Twilight" saga.

Grace has joined the cast of "Breaking Dawn" as Irina, Deadline reports. The character is a vampire who mistakenly identifies Edward ( Robert Pattinson) and Bella's ( Kristen Stewart) child as an "immortal child" -- i.e., a human child who has been turned into a vampire, a practice outlawed by the Volturi.

Her claim becomes a source of major conflict in the novel, and we expect much the same from the film.

"Breaking Dawn" is scheduled to begin filming later this fall, with part one due for release in November 2011 and the final installment a year later.