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Michael Sheen is best known for his portrayal of David Frost in "Frost/Nixon" and former British Prime Minister Tony Blair in a few projects, including "The Queen." But he has also appeared in three "Twilight" films, including the final one, which opens Friday.

Sheen reprises his role of the villainous vampire Aro in "The Twilight Saga: Breaking Dawn - Part 2." How does his character compare to his signature role of Blair?

"Well, one is a slightly self-delusional psychopath, and the other one is Aro," he joked at a recent news conference.

Sheen, 43, also said young Twilight fans often don't recognize him.

"I've got long black hair and all that, and white face [in the film], so people tend not to kind of know that it's me. Until some parent goes, 'See that guy over there, he's in Twilight.' And then they … go crazy," he said.

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The actor promised that "Breaking Dawn - Part 2? will tug at your heartstrings.

"I've seen the film twice now I think, and each time we get to the end, I'm bawling," he said. "Goodness knows what 14-year-old girls are going to be feeling like."