Jennifer Lawrence, InStyle

Michaelangelo Di Battista/InStyle

Jennifer Lawrence's body looked nothing short of amazing in a backless Dior gown today in London.

So, what's her secret? Er…Nothing.

In the December issue of Instyle magazine (out Nov. 15) the Catching Fire star confesses that can't get herself to eat healthier. "During Hunger Games, when I was eating ungodly amounts, I used to tell myself, 'Stop eating, people are going to see this. This movie is going to be around forever.' But nope! I was like, I still want candy and I still want a hot dog!"

The same goes for working out. "Nothing can motivate me," she shares. Not even prepping for her nearly naked role as Mystique. "Then X-Men started, and I thought, 'Oh definitely, I'll work out and diet.' But nope. Not me!"

The Oscar winner is completely lighthearted about her costume (or lack there of) for the role, one that is mainly blue body paint. "It's like wearing rubber paint," she says. "Very dehydrating. I drank bottle after bottle of water and I only peed twice a day."

Body paint is fine with J.Law but hair color is not. The star—who recently debuted her new pixie cut—explained she won't be dying her tresses ever again. "No more color after Hunger Games," she swears, adding: "It'll all fall out!"

This mirrors what she said recently about her fresh cut being a result of her hair being "fried from being dyed too much." In case you're wondering what they will do for the Mockingjay films, she already has a solution:

"This isn't how Katniss is going to look in the next movies, don't worry," she said, referring to her short haircut. "I'm wearing a wig."

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