Robert Pattinson and Kristen Stewart have "complex feelings for each other," Twilight director Catherine Hardwicke tells the December issue of Vanity Fair.
"What Rob and Kristen had is a multitude of feelings for each other," she goes on, adding that their characters' chemistry -- which she describes as "complex, intense fascination" -- is "what we needed" for the vampire series.
She says the co-stars have a "nervous attraction" off screen.
Still, the two aren't dating, Pattinson, 23, swears.
"It doesn't make any difference what you say [to the tabloids]. I've literally been across the country [from Kristen], and it's like 'Oh, they were on secret dates!' It's like 'Where? I can't get out of my hotel room!'"
(Stewart's take on their supposed affair? "It's so retarded," she says. "We're characters in this comic book.")
Pattinson says Stewart, 19, has "influenced how I've done all the Twilight stuff. It's quite nice to have someone who is genuinely indifferent to the whole spectacle of everything."
The actor admits he's "unbearably self-conscious about stuff." While taping new Moon (out Nov. 20) in New York City, he says, he was terrified his "a*s crack [was] showing" in paparazzi photos.
Despite his good looks, he thinks he resembles "a cartoon character," he says. Pattinson thinks one of his legs is longer than the other, making him look "like an idiot."
20 Fun Facts about Robert Pattinson
Robert is 6'1".
2. Breakout Role
RPattz's breakout role was as Cedric Diggory in "Harry Potter and The Goblet of Fire."
3. Musical Talent
Robert is an accomplished musician on both guitar and piano — his own music was featured in "Twilight." Remember the scene where he and Bella had dinner? That's Rob in the background, singing “Never Think.”
4. Inspired By...
Robert says his main acting inspiration is Jack Nicholson.
5. Potter Pals
Robert is real-life friends with "Harry Potter" co-star Katie Leung, who plays Cho Chang.
6. The Baby
RPattz has two older sisters — one of whom had a top ten hit with her own band.
7. Hot Stuff
Robert was chosen by Rolling Stone as the Hottest Actor of 2008.
8. Miss Claudia
Rob's two older sisters used to dress him up as a girl and call him Claudia.
9. Older Guy
Robert is four years older than his "Twilight" co-star Kristen Stewart.
10. Drivers Wanted
Robert told Ellen DeGeneres that he didn't know how to drive.
11. Faking It
RPattz had to fake an American accent for "Twilight."
12. No Baseball Pro
Robert had to learn how to play baseball for his role as Edward Cullen.
13. Spot On
Robert played artist Salvador Dali in 2008's "Little Ashes." He spent three days learning how Dali pointed his finger.
14. Pucker Up
Robert's first kiss was when he was 12-years-old.
Robert has said he's confused by UGG boots as a trend.
16. Secret Crush
RPattz has said he secretly loves Pippi Longstocking.
17. Top Pick
One of Robert's favorite TV shows is the British series "X Factor."
18. Trading Places
When Seventeen magazine asked RPattz who he would trade places with, he said, "Someone who has lots of respect or power. George Bush, possibly."