Kristen Stewart has reportedly reconciled with Robert Pattinson. File picture: PA Wire

Kristen Stewart has revealed her relationship with co-star Robert Pattinson helped her to play his on-screen love interest in the Twilight films.

The 22-year-old actress said she found it easy to play Bella Swan, who is hopelessly in love with Robert’s vampire character Edward Cullen, because she has experienced that feeling in real life.

She told TV show ‘Entertainment Tonight’: “I know what it’s like to love something so much.”

The couple recently got back together after Robert, 26, forgave Kristen for cheating on him with married director Rupert Sanders.

Meanwhile, Robert confessed shooting the intimate sex scenes for the vampire movie was not easy because they had to look sexy while still making the movie suitable for a younger audience.

Referring to the scene in ‘Twilight Saga: Break Dawn - Part 2’, Robert said: “The sex scene in this one is pretty ridiculous as well, you’re shooting stuff to be PG, you’re trying to think of things to make it sexy, it’s supposed to be about the greatest vampire sex you’ve ever had.

“You try and give a face of ecstasy, guy’s faces I don’t think are really designed to do that.”