Kristen Stewart fell in "love at first sight" with Robert Pattinson.

The real life couple play Bella Swan and her vampire love Edward Cullen in the Twilight Saga movie series. Catherine Hardwicke—who directed the first Twilight movie—said Kristen felt an instant attraction to her co-star.

Catherine said: "I looked at a couple pictures and was like, 'I'm not sure.' He had been fired from his last job, he was unemployed, he was in debt.

"I have footage of their first meeting at my dining-room table. Kristen was like, 'It's got to be Rob!' She felt connected to him from the first moment. That electricity, or love at first sight, or whatever it is."

While Kristen, 20, eventually managed to convince the director to hire Robert, Catherine revealed she made him promise not to get romantically involved with his co-star because she was only 17 at the time and he was four years older.

She explained to Newsweek: "I told him, 'You've got to realize that Kristen is 17 years old. She's underage. You've got to focus, dude, or you're going to be arrested.' I made him swear on a stack of Bibles."