Credit: Kevin Winter/Getty Images Photo: Kristen Stewart and Rupert Sanders at a Los Angeles Screening of Snow White and the Huntsman on May 29, 2012

UPDATE: Us Weekly has photos of Kristen Stewart's makeout session with director Rupert Sanders. One photographer tells the magazine, "It seemed like they couldn't get enough."

 

ORIGINAL STORY: If this is true, consider us blown away.

According to several sources for People magazine, Kristen Stewart hooked up with Snow White and the Huntsman director Rupert Sanders. It apparently happened recently, though an insider says it wasn’t a recurring thing.

"She wasn't having an affair with Rupert. It was just a fleeting moment that shouldn't have happened," spills the source. "She never meant to hurt anyone. She's a good person who just made a bad choice."

Although she's notoriously guarded about her private life, Kristen has been dating her Twilight co-star Robert Pattinson for over two years now  and the "It" couple was dodging engagement rumors before this story broke. A source close to R-Pattz tells E! Online, "Kristen is perfect to him. That's why he's always known that someday she would be his wife."

The 22-year-old actress is reportedly "devastated" by her "complete lapse in judgement."

Rupert is married with two children.

Sources: PeopleUs WeeklyE! Online

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