Famous Teens: Amanda Seyfried
Amanda Seyfried takes on the demon Megan Fox

Plucky utility player Amanda Seyfried has held her own on screen opposite everyone from Lindsay Lohan (Mean Girls) to Meryl Streep (Mamma Mia!).

But can she take on a demonic Megan Fox? It’s the ultimate nice girl/bad girl smack down in Jennifer’s Body, the Vancouver-shot horror comedy from Oscar-winning Juno writer Diablo Cody. The movie premieres at this month’s Toronto International Film Festival before hitting theatres September 18th.

“I, basically, have to go to drastic measures to save the town from this pretty satanic situation,” says the 23-year-old Seyfried over the phone from the film’s B.C. set.

“It’s horrifying, nobody believes my character. It’s only my second movie where I’m the lead, and it was pretty exhausting because I was working all the time. But it was always exciting, too.”

Filming in Canada was clearly a part of that.

“The set had a really fun vibe; the people were cool and laid-back,” Seyfried reports. “Everybody knew how they wanted the feel of the movie to be, scary and funny but with a lot of heart to it as well. Diablo does that; it’s so special and I’m so happy to be a part of it.”

The Pennsylvania native apparently liked it up here so much that she didn’t hesitate to sign up for the title role in Canadian auteur Atom Egoyan’s next movie, Chloe — even if, in some ways, it was scarier than the hormonally hyped-up splatterfest.

“I’m playing a prostitute in my next movie,” Seyfried explains, a tad nervously. “Everybody gets to see my…well, I’m sure full-on nudity couldn’t ruin a career, but it is a bold move.”

Megan Fox better watch her back, if you ask us.