Actress Kristen Stewart, who plays Bella Swan in the Twilight movie, admitted that she and co-star Robert Pattinson had instant chemistry making it easy for them to portray on screen romance.

The chemistry between artists is difficult to define. But in my case when I looked at Robert it was like I could look into his heart, and he could do the same, and that was very important, Stewart says. That's how I would describe the chemistry between us.