Chemistry in "Twilight" and "The good girl"

"Kristen Stewart sat on Catherine's bed and attempted kissing three different actors. Then Robert Pattinson came over and Kristen met him for the first time. And right after meeting each other, the two shared their first kiss. According to Catherine, "They had to do it three times. The first time, they went a little too far, and I was like, 'I can't show this to anybody at the studio!'" Wow, so Kristen and Robert were perfect for each other from the start". Source: www.limelife.com
"Kristen, 19, has previously blasted reports she is romantically involved with Robert.She said: “It’s just totally false. Robert and I are good friends. We went through a lot together, so we feel very close. But if we go out in public, every little detail is scrutinized, like the way I stand next to him.

“And it’s like, I know the guy really (expletive) well. It’s only natural that we sort of lean on each other, because we’re put in the most (expletive) psychotic situations.” Source: www.azcentral.com

“To decide who was going to be Edward, I had chemistry reads over at my house on my bed,” Hardwicke tells Life & Style, “and when it was Rob and Kristen together, you could just tell … this is it.”
Hardwicke says "it’s intense when you do such an intense project. Robert and Kristen are interested in each other, like a fascination.” Source: www.kansascity.com
"I don’t think there is any point in denying what’s going on between New Moon’s, Robert Pattinson and Kristen Stewart. This HOT duo is completely inseperable. I don’t think it’s possible to keep the flames down when you are working on such an intense project together.

May 13, they took the next step in their relationship: meeting the parents! Kristen bonded with Rob’s folks, Richard and Clare Pattinson, over Kobe beef meatballs during the actor’s 23rd birthday dinner at Glowbal Grill & Satay Bar in Vancouver". Source: backseatcuddler.com

"Back in 2001, Jen filmed The Good Girl with Jake Gyllenhaal, who at the time was a relative newcomer (his credits at the time included Donnie Darko and Bubble Boy). Not only did they share the screen in the quirky flick, but they shared a love scene, which for both actors marked a first. Jen was notably apprehensive about simulating such a private moment for all to see; she told In Style upon the film’s release that “unless you’re someone who gets off on having people watch you - which I’m certainly not - it’s weird having 40 crew members look at you in such an intimate situation.”

“Jake was as nervous as I was. Finally you just go for it. I couldn’t ask for a better, sweeter person to be devirginized on film with.” For his part, Jake discussed his experience working on the scene: “We had been making out for weeks in other scenes, and this was just some more hip grinding; some more kissing. Jennifer turned to me at one point and said, ‘That wasn’t so hard. I’ve faked it before.’” Throughout the production, he developed something of a protective stance toward his leading lady; he says that at one point, “I remember we were in bed one day, and Miguel Arteta screamed, ‘Stop joking around.’ And I thought, ‘This is Jennifer Aniston, motherf***er. You don’t yell at her.’”
Furthermore, they have continued to show a great deal of respect for each other’s work over the years. In 2005, Jen was on hand at the Hollywood Film Festival to present Jake with a Hollywood Breakthrough Award. Jake Gyllenhaal with Jennifer Aniston when he presented at the 18th annual GLAAD Media Awards in Los Angeles.

Jake returned the favor, presenting Jen with her GLAAD Vanguard Award. He gave a great presentation speech, citing Jen’s warmth and integrity as traits that he has come to know personally, and upon her arrival onstage he greeted her with a kiss. As Jake himself put it, “Everybody falls in love with Jennifer, and I have to say, it’s always her fault.” Source: foro.univision.com