Kristen Stewart to Robert Pattinson: I Did Not Sex Rupert Sanders!

In order to win back Robert Pattinson, Kristen 

Stewart reportedly opened up to the Twilight 

Saga stud by convincing him that she NEVER 

opened up to Rupert Sanders.

Pattinson and Stewart are back together and living under the same roof, sources confirm, with an insider explaining the key to the reconciliation as follows.

"Kristen and Rupert both told their respective partners that they didn't actually have sex," a mole tells Radar Online. "Kristen was absolutely steadfast that she only engaged in several make-out sessions with Rupert, but never slept with him. "

Pattinson didn't believe his costar at first, but Kristen eventually provided Rob with "passwords to her voicemail and e-mail account to prove she has nothing to hide and will do anything to get his trust back," the source adds.

Evidently, it worked. For now at least.

"There are still a lot of raw emotions there and time will tell if Rob and Kristen stay together," says this Person in the Know. "Rob and Kristen will be promoting the final Twilight movie and it will be very interesting to see what happens after that."

That is for certain. And THG will be there every step of the way to find out.