updated 02/23/2009 AT 1:00 PM ET
•originally published 02/23/2009 AT 1:10 PM ET
Stewart has been dating actor Michael Angarano since 2006, but that hasn’t stopped rumors of an off-screen fling with her Twilight costar.
“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 this guy really [expletive] well,” she says. “It’s only natural that we’re sort of leaning on each other, because we’re put in the most psychotic situations.”
Stewart and Pattinson will reprise their roles in the Twilight sequel, New Moon, which begins filming in March and is set to open on November 20, 2009. The third film in the series, Eclipse, will arrive June 30, 2010.