Robert Pattinson has confirmed that he’ll star in Breaking Dawn, the fourth movie in the Twilight franchise — he just doesn’t know when. In Cannes, before heading to Italy to shoot the final four days on New Moon, the actor told The Hollywood Reporter that Summit Entertainment hasn’t been able to set a start date for the final film because of his busy schedule. His plate includes shooting a romantic drama for the studio, Remember Me (formerly known as Memoirs); then wrapping the third Twilight film, Eclipse, this fall; and then joining Hugh Jackman and Rachel Weisz on the set of Madeleine Stowe’s directorial debut, Unbound Captives, perhaps as early as year’s end.

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EW’s ‘Twilight’ Headquarters (featuring photo galleries, video interviews, and more)

Cameron Bright will appear as Alec and Academy Award nominee Graham Greene will play Harry Clearwater in the Twilight sequel New Moon, Summit Entertainment announced on Wednesday. A press release on the studio’s website revealed the names of all new members of the cast, some of whom had been announced previously: "New cast members include the legendaryVolturi, a venerable coven of vampires who weigh and impose the laws ofthe vampire world, as well as two new members of the Quileute IndianNation. The Volturi include Charlie Bewley as Demetri, Jamie CampbellBower as Caius, Daniel Cudmore as Felix, Christopher Heyerdahl asMarcus, all Volturi enforcers. Dakota Fanning plays Jane, a highranking and powerful Volturi member and Cameron Bright is Alec, herbrother. Noot Seear plays Volturi member Heidi. Michael Sheen plays Aro,the Volturi leader. Graham Greene appears as Harry Clearwater, Quileutetribal leader and old friend of Bella’s father Charlie. Tinsel Korey isEmily, the fianceé of Sam Uley."

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Michael Sheen, the actor best known for playing Tony Blair and David Frost in the Oscar-nominated films The Queen and Frost/Nixon, has been added to the cast of the Twilight sequel New Moon. He’ll play Aro, the leader of the Volturi, director Chris Weitz confirms to The Daily Mail. The actor was "aggressively" pursued, Weitz added. "Michael’srole is so important because he’s the head of all vampires. Aro is, on the surface, a very gracious and friendly vampire, butbeneath that he is a tremendous threat." Sheen should be at home in the fantasy realm: He played the Lycan (or werewolf) Lucian in the Underworld films.

More on ‘The Twilight Saga: New Moon’:
‘Twilight’ sequel: Is Michael Sheen right for ‘New Moon’?
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‘Twilight’ poll: Dakota Fanning is Jane, who should be Alec?
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‘Twilight’ sequel: New details on ‘New Moon’
‘Twilight’ sequel: Chris Weitz to direct ‘New Moon’
‘Twilight’ sequel: Who would you recast?
 EW’s ‘Twilight’ Headquarters (featuring photo galleries, video interviews, and more)

British actor Jamie Campbell-Bower has been cast as Volturi leader Caius in the Twilight sequel New Moon. The 20-year-old Taylor Hanson-lookalike, whose credits include RocknRolla and Sweeney Todd, tells BBC News that he will head to the set in June. "I do know who else will be in it — but I can’t tell you, unfortunately," he said. "Butgo online and have a look at the rumors…. They’re all false. You’re putting me in a terrible situation."

More ‘The Twilight Saga: New Moon’:
‘Twilight’: The wolf pack is cast
‘Twilight’ poll: Dakota Fanning is Jane, who should be Alec?
‘Twilight’: Dakota Fanning will star in ‘New Moon’
‘Twilight’ star Robert Pattinson talks ‘New Moon’ at the Oscars
‘Twilight’ stars, Dakota Fanning talk ‘New Moon’
Dakota Fanning offered role in ‘New Moon’
‘Twilight’: Taylor Lautner keeping Jacob role
‘Twilight’ sequel: New details on ‘New Moon’
‘Twilight’ sequel: Chris Weitz to direct ‘New Moon’
‘Twilight’ sequel: Who would you recast?
 EW’s ‘Twilight’ Headquarters