“Twilight” beauty Kristen Stewart, bad habits are catching up with her. Weeks of heavy smoking, staying up late and eating badly have forced her to diet to get back into shape for “Breaking Dawn” filming in November.

“It’s kind of embarrassing,” Stewart confessed. “But I’m playing a vampire soon, and I eat disgustingly normally. And so, right now, I’m trying to not put so much butter in my food and stuff like that.”

Kristen has been making the rounds to promote her latest film “Welcome to the Rileys,” about a down-and-out teen-aged girl who is taken in by a family that just lost their daughter.

“Breaking Dawn,” which co-stars Robert Pattinson and Taylor Lautner, is set to begin shooting in Vancouver next month, and will hit theaters in November 2011.

During the summer, Stewart, 20, ate fatty foods, smoked heavily and slept poorly while shooting “On The Road,” a movie based on ’50s beat icon Jack Kerouac’s novel about his travels to discover himself.

“She ate badly, smoked tons of cigarettes, and stayed up late,” Jake Scott, the director of “Welcome to the Rileys,” told People. “She embraced the habitual nature of the character.”

While the naturally skinny Kristen is hardly fat, she had to overhaul her diet recently to look more the part of the 110-pound teenager Bella in “Breaking Dawn Part 1,” the next to the last film in the “Twilight” vampire series.

Stewart also felt pressured to take better care of herself because Bella eventually becomes a vampire, and vampires are known for their stunning, ethereal beauty, lithe physiques and porcelain skin.

So is the diet working? “Yeah,” she says. “I feel better, so I guess so.”

Kristen also had to change hair color, which she had dyed strawberry blonde this summer for “On The Road.”

“I was blonde a little while ago,” she says. “So now I’m dark again for ‘Twilight.’ I feel much more myself with darker hair.”

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