To help you out, here's a handy "Who's Who" list of the new additions:
Renesmee (Mackenzie Foy)

Irina Denali (Maggie Grace)

Tanya Denali (MyAnna Buring)

Katrina Denali (Casey LaBow)

Carmen (Mia Maestro)

Eleazar (Christian Camargo)

THE AMERICAN NOMADS

Lee Pace is taking on the role of Garrett, Carlisle's close friend and the future mate of Katrina Denali. Pace was nominated for a Golden Globe for his work in the TV movie 'Soldier's Girl' (2004), and he also starred in 'Pushing Daisies' (2007-2009), 'A Single Man' (2009) and 'Marmaduke' (2010). Garrett is a tall, handsome vampire with sandy hair and a ponytail. He has an adventurous spirit, and joins the Denali coven after the Volturi leave.
Peter (Erik Odom)
Peter will be played by Erik Odom, who has had roles on TV's 'The Bureau' (2009) and 'Wicked Attraction' (2009). Peter's change occurred in the aftermath of the Southern Vampire Wars, during which he befriended Jasper and became mated to Charlotte. Peter is described in the books as a tall, blond vampire. He and Charlotte came to Forks to lend support to the Cullens against their standoff with the Volturi.

Peter's mate, Charlotte, will be played by Valorie Curry, an actress who appeared in several episodes of the critically acclaimed TV show 'Veronica Mars' (2005-2006). The tiny and white-blond Charlotte was created for Maria's newborn army and was about to be destroyed by Jasper when Peter yelled for her to run. Both escaped safely, eventually becoming mates. She and Peter stayed friends with Jasper and the Cullens, visiting regularly.

Toni Trucks will play Mary, an American nomad who has come to help the Cullens against the Volturi. As an actress, Trucks has had roles on the big screen, in 'Music and Lyrics' (2007), as well as on television, in 'All of Us' (2007) and 'Veronica Mars' (2007).

Another American nomad allying with the Cullens, Randall will be played by Bill Tangradi. You may recognize him from TV's 'Terminator: The Sarah Connor Chronicles' (2009) or 'The Good Wife' (2010).
THE EGYPTIAN COVEN

Amun, the leader of the Egyptian coven, will be played by Omar Metwally. The actor has had roles in 'Rendition' (2007) and 'Munich' (2005). Although Amun came to help the Cullens against the Volturi, he is mistrustful of Carlisle, fearing he might try and "steal" Benjamin.

Andrea Gabriel, who is known for her roles on TV's 'Lost' (2004-2010), 'House' (2009) and 'Criminal Minds' (2006), will portray Kebi, Amun's quiet and obedient mate. Kebi stood alongside Amun and the rest of her coven as a witness for the Cullen family, but neither her nor Amun would touch Renesmee.
Benjamin (Rami Malek)


Benjamin's mate Tia will be played by Angela Sarafyan, whose work includes 'Love Hurts' (2009) and appearances on television's 'The Mentalist' (2008) and 'CSI: NY' (2006). Bella Swan calls Tia a quiet woman, "though when she did speak there was great insight and gravity to everything she said."
THE AMAZON COVEN

The role of Senna will be played by newcomer Tracey Higgins. Senna -- described in the book as a dark-haired, tall and long-bodied character who wears animal skins -- is a quiet member of the ancient Amazon coven. The coven has lived outside civilization for eons, and no longer attempt to seem human while maintaining the traditional vampire diet.

Zafrina (Judi Shekoni)
The British-born Judi Shekoni will play Zafrina, whose special ability to create visual illusions was going to help the Cullens' plan of attack against the Volturi. Zafrina helped Bella harness her mental-shield powers, and in doing so, became close to Renesmee. Shekoni has been on TV's 'Brothers and Sisters' (2007) and the UK's 'EastEnders' (2002).
THE IRISH COVEN

Marlane Barnes, who will also co-star in Terrence Malick's new movie 'Tree of Life,' will play Maggie, the small, red-curled vampire whose special ability is to know when she is being lied to -- a skill the Cullens found critical to knowing what the Volturi, especially Aro, meant to do with Renesmee.

Lisa Howard will play Siobhan, one of the Irish coven's leaders. Carlisle believes she has the gift of influencing events by willing their outcome in reality. But will her wishes for the Volturi battle come to fruition?
Liam (Patrick Brennan)
Patrick Brennan will portray Liam, Siobhan's mate and the other leader of the Irish coven. Described in the book as hard-faced and physically imposing, he arrives along with his coven to ally with the Cullens against Aro's coven.

Noel Fisher will play Vladimir, whom Jacob rather aptly nicknamed "Dracula." Vladimir and Stefan showed up in Forks uninvited, but wanting to participate in what they hoped would be the defeat and destruction of the Volturi, who unseated them from their perch as the ruling vampire family. Fisher's past work includes TV's 'Law & Order: Special Victims Unit' (2009) and 'The Riches' (2007-2008), as well as 'Final Destination 2' (2003).

Stefan will be played by Guri Weinberg, whose past films include 'You Don't Mess With The Zohan' (2008) and 'Munich' (2005). Along with Vladimir, Stefan also desires revenge on the Volturi.
The European Nomad, Alistair (Joe Anderson)

Holy red-eyed vampires, Batman! This is quite an epic cast for 'Breaking Dawn'! Of course, Summit hasn't confirmed that all roles have been cast, and there are still a few unannounced ones (Kachiri, anyone?). In the meantime, you can start counting down the days until 'Breaking Dawn Part I' hits theaters on Nov. 18, 2011.
http://blog.moviefone.com/2010/10/14/breaking-dawn-cast-twilight/