Twilight sweethearts may be calling it quits soon. According to PEOPLE, Kristen Stewart cheated on her boyfriend Robert Pattinson with a married director.

Stewart may have gotten cozy on the set of "Snow White and the Huntsman" with her director Rupert Sanders. Sources claim that the hookup was recent.

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

Both Sanders (41),  who is married to British model Liberty Ross and has two small children, and Kristen have not denied or confirmed the scandal.  However Kristen is said to be troubled by her slip-up.
"Kristen is absolutely devastated," says one source. "It was a mistake and a complete lapse in judgment." 

The 22-year-old actress and her 26-year-old boyfriend were coupled up just a week ago at Comic-Con. They even opened up about their on-camera romantic scenes. The once discreet pair, have recently shown more public affection. Stewart even raved about her boyfriend's acting performance in his new upcoming movie "Cosmopolis". The couple met on the set of the first "Twilight" in 2007and have been together ever since. 

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