"The Twilight Saga" has cast the Denali vampire coven, a rep for Summit, the studio behind the franchise, confirmed to Access Hollywood.
Christian, 39, previously starred as Dexter's serial killer brother, Rudy Cooper, in Showtime's "Dexter," while Casey had a three-episode stint as Ella McBride on "CSI: NY" during the show's 2008-2009 season.
Mia Maestro might be best known for playing Nadia Santos, the sister of Jennifer Garner's Sydney Bristow character, on "Alias." MyAnna Buring, a Swedish actress, has had roles in "Devil's Playground," and "Grindhouse."
As previously announced, actress Maggie Grace of "Lost" fame will star as vampire Irina, also a member of the Denali coven, which attends Bella and Edward's wedding.
"Breaking Dawn," which will be released in two installments, is slated to start filming in November.
The Hollywood Reporter was first to report the casting news.