Kendall Jenner is posting "racy" photos on Instagram to outdo her sister.

Kendall and Kylie Jenner

Kendall and Kylie Jenner

The 'Keeping Up With The Kardashians' star is reportedly planning to post more risque photos like her sister Kylie in a bid to gain more followers than the 17-year-old television personality.

A source told HollywoodLife.com: "Kylie and Kendall are competitive over who has more Instagram followers. Kendall has always had more, but now Kylie is closing in on her fast.

"Kylie has told Kendall that she will pass her by 2016! Kendall isn't happy about that and says she's going to post more racy pics to keep up with her little sis."

Meanwhile, the 19-year-old model previously revealed she is obsessed with Kylie and texts her multiple times a day, even if she doesn't respond.

When asked about their friendship, she said: "If you really want the truth, I text Kylie so many times and I look like a desperate girlfriend or something because she does not respond to me. She loves me though so it's ok."

Kendall also insisted she doesn't worry about having her make-up perfect when she poses for selfies to upload on her social media accounts.

She added: "Every girl knows, for that one selfie that gets posted, there's like a hundred that goes behind it. The worst thing you can do in a selfie, there's not really anything you can do bad in a selfie."