'Twilight Saga's' Renesmee unveiled

Kristen Stewart and Robert Pattinson look way too young to be parents in a new photo of the pair as their "Twilight Saga: Breaking Dawn - Part 2" alter-egos, Bella Swan and Edward Cullen.

But then again, they're (now both) vampires who became immortal in their late teens, and again once more, their daughter Renesmee is a human-vampire hybrid who practically ages in dog years.

Mackenzie Foy, the actress who plays the vampire couple's daughter in the final "Twilight Saga" film, "Breaking Dawn - Part 2," is 11 years old.

Entertainment Weekly snapped a family portrait of the three for their latest issue, in which Stewart, currently riding box office success with "Snow White and the Huntsman," notes how much Foy really does look like her.

"Even our hands look similar," Stewart, 22, said. "It was kind of strange. But it's funny how it actually helps. It's like, 'Oh, hey, you look like me, kid! Come on!"

Playing the part of her parents carried over behind-the-scenes as well, said director Bill Condon, with 26-year-old Pattinson showing his "paternal" side and Stewart being "protective."

It sounds like Foy used those instincts to her advantage, too: "We're all around the same age and we're not really polite to each other anymore," Pattinson said of the "Twilight Saga" cast's relationship. With Foy on set, "you'd have to tone it down when Mackenzie was around. She had a little swear jar and I think she made 850 bucks or something."

Undoubtedly Foy'll make way more than that when "Breaking Dawn - Part 2" arrives in theaters November 16.