Kristen Stewart Cheated on Rob Pattinson With Married Director

July 25, 2012 By:
UPDATE: "I'm deeply sorry for the hurt and embarrassment I've caused to those close to me and everyone this has affected. This momentary indiscretion has jeopardized the most important thing in my life, the person I love and respect the most, Rob. I love him, I love him, I'm so sorry," Stewart said in a statement Wednesday.

Is Kristen Stewart sucking on another man’s neck?

Sad news from everyone’s favorite melodramatic vampire couple… According to several reports, Kristen Stewart cheated on Rob Pattinson with the married director of Snow White and the Huntsmen, Rupert Sanders.

People magazine reports the scandalous news… According to a source who spoke with the publication, not only is this reported info true, it has rocked the couple’s world as of late.

"Kristen is absolutely devastated," says one source. "It was a mistake and a complete lapse in judgment."

Though they initially held their relationship from the light, Kristen and Rob have been officially dating for about two years now, after meeting as co-stars of the now massively successful Twilight Saga franchise. The duo made everybody’s dreams come true – including their own - when they took their onscreen romance to real life.

Sanders – no relation to the Colonel – shares two children with his current wife.

The source tells people that the Stewart-on-Sanders action was more of a hook-up than a full-fledged affair.

“It was just a fleeting moment that shouldn't have happened," the source said. "She never meant to hurt anyone. She's a good person who just made a bad choice."

No word yet on how this will affect Kristen and Rob's relationship or if they will be able to keep their paws to themselves moving forward.

Kristen and Rob’s new movie, Twilight Saga: Breaking Dawn – Part 2, the finale to the series, is currently scheduled for a mid-November release.