According to actress’ friends, the 22-year-old is said to be having a tough time dealing with her break-up. "Kristen is a nervous wreck and existing on a diet of cigarettes, sugar-free (energy drink) Red Bull and the occasional bag of potato chips,” Contactmusic quoted a source as telling

 Kristen Stewart
Kristen Stewart. Pic/Santa Banta

"She's been hiding out at the Los Angeles home of a producer friend and is looking pale and worn-out. Whenever anyone tries to push her to eat even a small bowl of soup, she either claims that she's just had something, which isn't true, or that she's nauseous and there's no chance of keeping anything down.

"Kristen is grief-stricken and has hit rock-bottom. In many ways, Kristen living off cigs and Red Bull is a way of punishing herself,” the source said.

The inconsolable actress has been keeping a low profile since her split in July, and even cancelled an appearance at the MTV Video Music Awards, which she was due to co-host with Pattinson next month.