Kendall Jenner is, according to multiple sources, such an egomaniac she believes she's better than her entire Kardashian family in most aspects -- from looks to success.

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Kendall, 18, seemingly became an overnight success in the modeling industry, having appeared at Paris Fashion Week and landed a coveted fashion spread in French Vogue's June/July issue. Sources told OK! Weekly that Kendall's modeling contracts could be worth $12 million and she's gone to great lengths to prove she's surpassed her family's legitimacy and fame.

"She thinks she's the hottest sister by far," a source told OK! in a recent issue. "Now that she's famous and heavily involved in fashion, she sees herself as better than everyone else."

An insider explained Kendall has little regard for what her family thinks.

"She's one serious piece of work -- and everyone's fed up with it," said the insider. "If she keeps getting so much attention, she's only going to get worse."

Kendall reportedly has a very big head and believes she's the most in-demand member of her family. It's gotten so bad, Kendall is allegedly now demanding twice as much as her sisters Kim, Khloe and Kourtney to film Keeping Up with the Kardashians.

Before Kendall even decided to pursue modeling, Kim flew her to New York to network with industry contacts, and instead of talking Kim up for the kind gesture, Kendall allegedly put her down.

"Kim originally wanted to do runway [modeling] but ended up being too short for it," Kendall noted at the time. "I think she's taking her fantasy out on me."

The alleged "less-than-gracious" reality TV star strutted her stuff at the 2014 MET Gala, wearing a peach-colored mermaid gown in attempt to outshine her sister Kim, who had been struggling to lose her baby weight after North West was born in June 2013.

"Kendall knew that Kim was feeling really insecure about her weight," another insider told OK!. "But it didn't matter. All she cared about was looking better than Kim."

Kendall also reportedly bragged about her French Vogue photo shoot -- which took very little effort to achieve -- after Kim had been campaigning for years to grace Vogue's pages. Editor Anna Wintour ended up allowing Kim and husband Kanye West to pose for the magazine's cover just this past April.

"Kendall totally rubbed it in Kim's face that she and Anna are, like, 'total besties' after she sat next to her at London Fashion Week," another source said. "It's like Kendall gets a little thrill every time she puts down Kim. She's even told Kim she's a 'total joke.'"
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The behavior would be consistent with a June episode of Keeping Up with the Kardashians in which Kendall yelled at her mother Kris Jenner for dancing to music at a SoulCycle class.

"Do you always have to be the center of attention? It's so annoying," Kendall barked, adding, "Eww, Mom, you're so embarrassing, you need to act your age. Desperate f-cking whore!"

That same episode featured Kendall leaving Kris to solely clean up their dog's mess. Kendall, described as "self-centered" by sources, couldn't wait to legally become an adult so she could move out of her mother's house. Kendall now lives in a $1.4 million condo in Los Angeles.

"The minute Kendall turned 18, she was off and in her own little land," the second source said. "In her head, she thinks of herself as this grown-up, sophisticated woman, but in reality she can't even take care of a dog, let alone a household."