“LOST” alum Maggie Grace is set to star in Summit Entertainment’s fourth and final Twilight Saga movie: Breaking Dawn. Grace will play Irina Denali, a vengeful vampire out to make Bella Swan’s life like totally bad or something.

Summit is splitting Breaking Dawn into two movies with the first premiering on Nov. 18, 2011 and the second on Nov. 16, 2012. Grace will star in both films.

Best known to TV fans as Shannon Rutherford on ABC’s sci-fi drama “LOST,” the 27-year-old starlet has also turned in memorable roles in last year’s Malice in Wonderland, a clever retelling of the “Alice in Wonderland” fable, the 2008 abduction-thriller Taken, and Columbia Pictures’ 2005 remake of John Carpenter’s The Fog.