Kristen Stewart With Justin Theroux and Others: Has She Cheated From Day One?

Not even a week after Kristen Stewart and Robert Pattinson were seen back together during a weekend outing, a rumor has surfaced that Stewart was flirting with another man. Is it possible for the couple to ever peacefully reunite?

The most recent rumor has accused Kristen Stewart of flirting with Jennifer Aniston's finace, Justin Theroux. According to reports, Stewart was out at Hollywood's Chateau Marmont with a friend when she approached the 41-year-old actor. The pair separated from the crowd and Stewart was seen touching Theroux's hand.

The incident occurred on Oct. 3, before Stewart and Pattinson were spotted together on a date over the weekend. The couple also shared dinner with friends on Monday night.

However a second report has alleged that Kristen Stewart's affar with director Rupert Sanders is not the first time that she cheated on Pattinson.

"When they first got together, she was going back and forth between Rob and her ex-boyfriend Michael Angarano," an insider told OK! magazine. "Eventually she did end it completely with Michael, but it went on or a lot longer than Rob ever knew."

The source went on to accuse the actress of living through a real life "Twilight" scenario by adding that a factor that led up to Stewart's separation from her ex was her relationship with Taylor Lautner.

"Everyone knows about their friendship, but not very many people know how close they really got," the source continued. "She even lied about it to Rob."

The source also stated that a third indiscretion occurred between Stewart and a production assistant on set.

"When she worked on 'Welcome to the Rileys,' she had a full-on fling with one of the production assistants. Luckily the guy had a girlfriend, so he was just as paranoid as she was and they kept it pretty well hidden," the source added.