Kristen Stewart is reportedly petrified of what may be divulged if lovers Robert Pattinson and Rupert Sanders had a meeting.

The Twilight starlet revealed that she had an affair with her Snow White and the Huntsman director Rupert, much to the dismay of her rumoured ex-boyfriend Robert.

Robert is said to be intent on having a face-to-face discussion with Rupert over his liaison with Kristen.

The actress is in shambles over the potential conversation.

"She is terrified about what Rupert might say," a source told the US edition of OK! magazine. "She knows that if Rob hears any details of the affair, he'll never be able to forgive her. She's scared that Rupert will try to appeal to Rob on a man-to-man level and paint her as the bad girl."

Kristen is said to be an absolute wreck at the moment.

"She has not stopped crying since this happened," the insider revealed. "She can't eat, she can't sleep, she's been chain-smoking and even starting off her day with a glass of merlot, and then going back to bed at noon. She has this tough, hard shell, but Rob was her world; he was her everything."