Jennifer Lopez can't resist eating junk food.

The singer - famous for her voluptuous curves - works hard to stay in shape when she has a new project to promote, but satisfies her calorific cravings when she has time off.

Jennifer told Cosmopolitan magazine: "If I've got a movie or an album to promote, I'll work very hard to stay in shape for those few months. But I eat McDonald's every now and again, and go through phases where I don't exercise at all."

"Even though I always try to eat healthily, I'll often allow myself a nice treat, like a chocolate-chip cookie - I just won't eat the whole packet!"

"If I'm putting on pounds, I tend to be more careful what I eat but I don't do anything drastic. I'll eat a little bit less and exercise a little bit more."

"Also, I'll work out with my trainer twice a week and eat more fish and steamed vegetables but I'll still eat carbs."

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