Following a tearful reunion and heart-to-heart chat, it's believed Kristen told Rob the fling was just a 'stupid mistake' and the actor has allegedly chosen to accept her apology.
A source told The Sun: "They pretty much decided they couldn't live without each other, Kristen poured her heart out to Robert and told him it was a one-off and a mistake."
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And R-Pattz, despite the photos of her kissing married Rupert Sanders, has decided to take her back.
The source says: "Rob sees it as Kristen made a really stupid mistake. After a lot of long tearful talks, they've worked it out."
The pair are believed to be moving back in together in a secret LA location.
Guess all those rumours of dates with Katy Perry were a load of twaddle then.
In case you have been loving under a rock, weeks ago now, Kristen confessed to cheating on Rob with married director and father of two Rupert Sanders.
Rob moved out the LA home they shared together, before doing loads of awkward interviews where he avoided the subject with awkward jokes.
Meanwhile Kristen allegedly went into hiding, cancelled a load of appearances before appearing on the red carpet at the Toronto Film Festival saying she was 'fine' and looking better than ever.
However, it was believed the couple had remained separate until now, coincidentally just in time for them to do promo for the next Twilight movie!