American reality television star Kim Kardashian is reportedly not happy with Kendall Jenner's growing success. The 20-year-old Keeping Up With the Kardashians star is on the cover of Vogue's 2016 September issue.

According to Radar Online, the 35-year-old reality star is jealous of the Victoria's Secret model. A source said: "Kim threw some major shade at Kendall! Kim seems to feel very threatened by Kendall."

"Kim will never allow any of her sisters to have more followers on social media than her. Especially Kendall!" the insider added.

The source continued: "Kim used to be closer to Kendall when they were younger, but not anymore. It seems like she will forever be jealous of her success!"

However, in an interview with Ryan Seacrest on KIIS FM, Kendall revealed that only two people knew about the magazine cover - Kris Jenner and Kardashian. She said: "I didn't tell anyone in my family. My mom obviously knew, and then I think I spilled the beans to Kim. But I think she's the only one that knew. She's the best person to give a secret to."

Adding on, Kanye West's wife had shared her excitement about Kendall's Vogue cover on Instagram. She wrote: "September Issue of Vogue!!!!!!! Yesss @kendalljenner True fan girl moment seeing my sister achieve her goals to the highest!!! Get it baby girl!!!!!#GenerationK"