The actress had to drop the weight she gained while playing combat fit Catwoman in The Dark Knight Rises, and she claims she lost 25 pounds (11.3 kilos) in just over a month to play sorrowful Fantine in the upcoming movie musical.

Hathaway lost weight under the guidance of skilled doctors, but she believes her diet was “not fun” and should not be replicated.

She says, “I lost the first 10 (pounds) in three weeks through a detox and then I lost the subsequent 15 in 14 days by doing food deprivation and exercise, which I don’t recommend.

“I know when I was a teenage girl… I would try crazy things and I do not recommend anyone do this at all.

“I was under the supervision of a nutritionist and I had a doctor monitoring me, but it’s not fun. You can be too thin.”

How Anne Hathaway Lost 25 Pounds for ‘Les Miserables’

Published November 13, 2012.

Actress Anne Hathaway poses for photographers as she arrives at a premiere in London. (Reuters)

Anne Hathaway makes the cover of Vogue magazine’s December edition and discusses the rigorous diet she underwent to portray Fantine, a prostitute dying of TB, in “Les Misérables,” which will be shown in theaters later this year.

Before “Les Miz,” Hathaway had already shed a significant amount of weight due to her part as Catwoman in “The Dark Knight Rises,” for which she followed a vegan diet and engaged in 10 months of weight training and martial arts instruction. To play the emaciated Fantine, though, Hathaway ate only two tiny squares of dry oatmeal paste each day. According to Vogue, she “had to be obsessive about it” since “the idea was to look near death.”

“Looking back on the whole experience — and I don’t judge it in any way — it was definitely a little nuts. It was definitely a break with reality, but I think that’s who [my character] Fantine is anyway.”

Hathaway, who turns 30 today, says she put in so much effort in the role, which is already generating Oscar buzz for her, that she struggled to return to her normal life after filming wrapped, and had to rely heavily on her beau, actor-turned-jewelry designer Adam Shulman, whom she married on September 29. “I was in such a state of deprivation — physical and emotional,” she admits. “When I got home, I couldn’t react to the chaos of the world without being overwhelmed. It took me weeks till I felt like myself again. The first time I really threw everything into a part, which was when I did ‘Rachel Getting Married,’ there was no one waiting for me when I got back. This time, Adam was there. He gets what I do and who I am and supports me in it, and that’s pretty awesome.

Hathaway describes Shulman as her “true love — the full-on romantic, till-death-do-us-part real deal,” and says their Big Sur, California, wedding was “a blast” as their pals “stayed and partied and danced till really late.” She said a lot of back and forth went into the construction of the Valentino gown, which was custom crafted by the retiring designer. “I begged him during the first fitting to make the train detachable,” Hathaway says. “He looked at me and said, ‘But it is a dress, not a costume.’ The memory of creating it with him is something that I will treasure forever. He somehow read my mind and designed the dress that I’d always wanted.”

While she won’t be adhering to the oatmeal diet, Hathaway does like her new, shorter hairstyle.

“I love the short-haired lifestyle. I’m turning 30, and — I hope this isn’t obnoxious to say — feel prettier, and much more myself. I guess I just feel much more satisfied with less now.”