Looking somber, slim and exhausted, Stewart stepped out for the first time after she was caught cheating on her boyfriend of three years Robert Pattinson, 26, late last month. Wearing a backwards baseball cap and sunglasses, the 22-year-old "Twilight" actress showed off her toned abs in a white crop top but kept her head down, holding a McDonalds coffee cup as she walked to her car.
"She isn't sleeping and she stays up all night crying," a source tells the new Us Weekly, out now, of Stewart. "She's close to a total meltdown."
On July 24, Us revealed exclusive photos of Stewart engaged in a steamy make-out session with her married "Snow White and the Huntsman" director, Rupert Sanders, 41. Since then, she's stayed out of the spotlight, splitting her time between her parents' home in Woodland Hills, Calif., and the Burbank, Calif., digs of her best girlfriend, "Runaways" costar Scout Taylor-Compton.
"She wants desperately to fix things and undo the mistakes she's made," a source of the actress recently told Us.
The actress won't be attending upcoming "Twilight" conventions, and neither will her co-stars Pattinson or Taylor Lautner, 20. But she will be stepping back out on the red carpet in September to promote "On the Road" at the Toronto International Film Festival. Promotions will begin in three months for the final "Twilight" saga film, "The Twilight Saga: Breaking Dawn - Part 2," which hits theaters on Nov. 16.
Keep clicking to see photos of Kristen in better days ...