Kristen Stewart is living on a diet of "Red Bull and cigarettes" in the wake of her split from Robert Pattinson.
The heartbroken actress - who was caught having an affair with Snow White and the Huntsman director Rupert Sanders - is not looking after herself properly as she comes to terms with the end of her relationship with her Twilight co-star, according to friends.
A source told Showbizspy.com: "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.
"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."
