Justin Bieber and Kourtney Kardashian made the headlines as it was reported on various websites that the celebrity duo is hooking up. As per Hollywood Life, however, it was reported that Kourtney's younger sister, Kendall, wanted to stop their flirtatious act.

Hollywood Life reported that Kendall does not want Bieber to hook up with her elder sister; this being said, she's asking her friend, Hailey Baldwin [which was Bieber's ex] to talk to Justin about it. Kendell's main reason to split them up is to protect her sister's future and to secure Kourtney's family.

A source exclusively told Hollywood life that Kendell is hoping that Hailey would succeed in splitting them up.

"Kendall has been pressuring Hailey to talk to Justin about Kourtney, and how much drama it's causing between her and Scott. Kendall thinks Kourtney and Scott still have a chance, but not as long as Justin's in the picture. She's hoping Hailey can knock some sense into his head."

Hailey and Justin have been close despite the fact that they're exes. They may still be close friends, but a source told Hollywood Life that Hailey doesn't agree with the fact that Bieber is hooking up with Kourtney. Though it's not a problem that Justin is seeing someone older than he is, what Hailey doesn't like is the fact that Justin is dating a mother.

"Hailey is doing her best to convince Justin that hooking up with Kourtney is not in his best interest," She said. "She's been telling him that it would be one thing if Kourtney did not have any kids, but the fact that she has three young children should be taken seriously."

Earlier this month, a source told Us Weekly that Bieber and Kourtney have been hooking up in the past and several news websites released a similar report in relation to the Bieber-Kardashian hook up.

"Justin bragged to friends recently that he has been hooking up with Kourtney Kardashian."

The secondary source then added that:

"Oh, yeah, that's definitely happening and has been for some time now, every time Kourtney and Justin are together they're extremely flirtatious. They text each other all the time."

In addition to the reports, it was also stated that Bieber has been close to the Kardashians for quite some time as he was spotted looking after Kourtney's kids. His former manager, Corey Gamble, is also dating the Kardashians' mother, Kris Jenner.