Kristen Stewart Cheated on Robert Pattinson: Report

K-Stew was photographed cozying up to her married Snow White director -- will this be the end for her and R-Pattz?

Just as Kristen Stewart and Robert Pattinson were beginning to go public with their open secret of a relationship, it appears that Stewart has cheated on her on-and-off-screen love -- with a married man!

According to Us Weekly, photographers caught Stewart, 22, in a series of compromising positions with her English Snow White and the Huntsman director Rupert Sanders, 41, on July 17. Not only is Stewart supposed to be in a monogamous relationship with her Twilight costar Pattinson, 26, but Sanders is married to British model-actress Liberty Ross, 33, with whom he has two young children.

One photographer told Us Weekly of the tryst: "It seemed like they couldn't get enough." But a Stewart source says the hookup photos aren't evidence of an affair, just a lapse in judgment.

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

Although reps for Stewart, Sanders and Pattinson have yet to comment on the Us cover story and affair allegations, a friend of Pattinson's has suggested what a blow this is to the devoted Twilight star.

"He worships her," the source told E! News. "He doesn't think there is another woman on the planet who is as beautiful and kind as her. He wants to be with her 24/7, he wants to marry her...as far as he is concerned, Kristen is his perfect match...Kristen is perfect to him. That's why he's always known that someday she would be his wife."

That's no surprise considering he recently shared the possibility of making Kristen the future Mrs. Pattinson. "It's not [true]. At least, not yet," Rob told BlackBook magazine. "But it is true that Kristen has always done something to me that others haven't."

With another one of celebritydom's most popular couples in crisis mode, it's unclear whether the Twilight lovers will recover from Stewart's infidelity -- or if they're headed for a split.

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