It looks as though Kim Kardashian might be a little jealous of her sister Kendall Jenner's modeling success, and is "stress eating" to make up for it. A new report suggests that Kardashian hasn't been able to control her diet because she is envious of her 18-year-old sister and all of the attention she's been getting in the fashion world.

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According to a source close to the reality television star, Kardashian was "pigging out" during Paris Fashion Week because she found it to be so stressful while the celebrity spotlight was more on Jenner than her.

An insider tells Radar Online on Tuesday, "She felt rejected next to Kendall. Kendall's young, thin and chic, which was grating on her."

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The source added, ""When Kim lets go, she really lets go, and the weight gain is like a rollercoaster. She was eating from the minibar and generally pigging out because she found Paris so stressful."

And it looks as though Kardashian's eating habits may have also taken a toll on her marriage to Kanye West, too.

The source explained, "She's been overindulging and in a bad mood, so Kanye's been feeling down, too. While they were in the most romantic city in the world, there were both so unhappy."

So far, neither Kardashian nor West have commented on the reports on their social networking accounts.

Tags: Kendall Jenner Kim Kardashian