It's true: maybe they did just have a little fumble in the back of his car, who knows?!
After all, it was just a 'momentary indiscretion'.
A source told HollywoodLife: "Kristen and Rupert both told their respective partners that they didn't actually have sex."
[Related article: Kristen Stewart cheats on Robert Pattinson]
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"Kristen was absolutely steadfast that she only engaged in several make-out sessions with Rupert but never slept with him."
'Make out session' being American for quick snog on the backseat we think…
The source continued, saying Rob took a while to believe this:"Rob didn't believe her in the beginning but as time wore on he accepted her explanation".
And now Kristen is believed to be doing everything she can to regain his trust, even giving him the passwords to her mobile and email accounts.
"Kristen has given Rob passwords to her voicemail and e-mail account to prove she has nothing to hide and will do anything to get his trust back."
It's now almost definite the couple are back together and living in LA.
It's also believed that Rupert's wife Liberty Ross is starting to forgive her husband after she was spotted out with her wedding ring on, albeit on her middle finger.