Typically, Kristen Stewart and Robert Pattinson are fighting off rumors about a baby or an engagement. The latter recently came out and said the couple isn't getting married any time soon.
But the Twilight Saga co-stars have a very different story to try and deny now: multiple outlets report Kristen cheated on Rob with Rupert Sanders, the director of Snow White and the Huntsman.
According to the latest issue of Us Weekly, Stewart and Sanders - who is married with two children - were actually caught in the act by photographers.
"It seemed like they couldn't get enough," a witness tells the tabloid of the make out session.
Why can't this be dismissed as just another ridiculous Robsten rumor? Because more respectable sources People and E! News have also confirmed the affair. The former says it was just a one-time fling.
"Kristen is absolutely devastated," an insider says to People. "It was a mistake and a complete lapse in judgment."
UPDATE: WHOA. Stewart has admitted to the affair and apologized for the incident.