American reality television star Kim Kardashian is reportedly not happy with Kendall Jenner's growing success.

According to the American edition of OK! Magazine, the 34-year-old Keeping Up With The Kardashians star was annoyed when the 19-year-old model was named the new global face of Estée Lauder last month.

"Kim is particularly jealous of Kendall and has it in her head that she's taking a ton of business away from her, so the knives are really out," the source said.

"They've had a lot of tensions recently, but the money-spinning Estee Lauder deal really pushed Kim's buttons and she's jealous as hell."

However, Jenner is reportedly fighting back and called Kardashian's naked photos on Paper magazine as "cheap and nasty."

"It's very ugly between these two at right now, and Kendall's alienating most of the family with her self-entitled, Queen Bee attitude," the insider added.

Meanwhile, Jenner had previously revealed that she banned Kardashian to attend her runway shows.

"Kim was invited to a lot of the shows that I was in," Jenner said, according to The Cut. "She called me before and was like, 'Hey, I was invited to the show, I just wanted to let you know. Do you want me to come?' and I was like, 'No.'"