Filming of Eclipse is scheduled to begin Monday. With most of the cast members busy bulking up for their fight scenes, Robert Pattinson and Kristen Stewart already in Vancouver and new cast members – Jack Huston and Catalina Sandino – are now signed on, Eclipse will be officially be in production in less than a week.

Jack Huston, the nephew of Anjelica and Danny Huston, stars in the upcoming ABC series Eastwick, which premieres on September 23 at 10pm. On Eclipse, Huston signed on to play the character of Royce King II, a human who lived during the Depression and was engaged to Rosalie Hale (Nikki Reed).

Another new cast member is reported to be Catalina Sandino Moreno, who appeared in the film “Maria Full of Grace” and the two-part epic “Che.” Moreno will play Maria, the vampire who creates an army of newborn vampires, including some from the Cullen family. Jasper Hale (Jackson Rathbone) becomes a key member of Maria’s army, helping her conquer Mexican territories.

Xavier Samuel and Jodelle Bree are also new on the set. They will be playing Victoria’s newborn vampires Riley and Bree.

“Eclipse” delves deeper into the pasts of the rest of his vampire coven. On this third installment of Twilight, Edward and Jacob will fight for Bella’s attention, but they are not the only ones who want her. The Volturis are back with vengeance, and they will stop at nothing for her blood. Victoria and her ravenous, blood-sucking vampires are on the prowl. Both camps of Edward and Jacob are forced to come together to protect Bella.

Eclipse will be directed by David Slade. It is believed to come out June 30, 2010.