02/23/2009 AT 01:10 PM EST
may be completely enamored with her undead boyfriend in Twilight
, but the actress insists her intense romance with costar Robert Pattinson
is reserved for the big screen.
"Rob and I are good friends. We went through a lot together, so we feel very close," the newly-minted It-girl says of her sexy costar
magazine's March issue.
Stewart has been dating actor Michael Angarano since 2006, but that hasn't stopped rumors of an off-screen fling with her Twilight
"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.
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