Did Kristen Stewart Cheat On Rob Pattinson?

The big news today is that Kristen Stewart cheated on Rob Pattinson with a man twice her age, the married director of her movie "Snow White and the Huntsman."

Even People magazine is reporting it saying, "She wasn't having an affair. It was just a fleeting moment. That shouldn't have happened. She never meant to hurt anyone."

Filming on "Snow White and the HUntsman atarted last august and wrapped in December. People Magazine's source says they didn't cheat during production ,it only happened recently.

However, US Weekly put a date on it, claiming it was last Tuesday, July 17th in Los Angeles. They report that Kristen and the director were caught by photographers in a "marathon make out session."