Kourtney Kardashian & Justin Bieber's Secret Hook-Ups Revealed: Scott Disick Ponders Cheating

Reports claimed that Kourtney Kardashian, 36, and Justin Bieber, 21, have been "hooking up" for the past four months, and it appears that their relationship is heating up.

Fans were baffled after the "Sorry" singer was spotted with the Keeping Up With the Kardashians star at the LA hotspot The Nice Guy on Dec. 11. The hot new couple were previously spotted together at an AMAs after-party and then at Knott's Scary Farm back in October. Bieber kept the rumors going when he shared an Instagram post of himself with a mystery girl along with the caption "Lord knows," which many assumed was a not-so subtle diss towards Kardashian's ex-boyfriend Scott Disick who calls himself "Lord Disick."

According to a report via Us Weekly, Justin and Kourtney have had a thing for four months, and the Canadian import has been bragging about their alleged hook-ups to his friends. An insider told the magazine that the strange new pairing acted much like a couple during their Dec. 11 sighting. Kourtney and Justin were even "super touchy-feely" when the party moved the karaoke bar Blue Dragon.
"They were all over each other. They were laughing and joking as they sang cheesy duets, and Kourtney spent much of her time on Justin's lap."
The couple then left the venue in separate cars that both led to Bieber's room at the Montage Beverly Hills hotel, where Kardashian was spotted leaving his room at 4 a.m. It's possible that they were partying well into the early morning hours. It's still not clear if Kardashian was the last to leave Bieber's room. The alleged snoop says that Kardashian has been taken by the Biebs and enjoys every moment that she spends with him.
"She's calling it a fling, but her feelings are clearly stronger than she's letting on. She's constantly texting and wanting to see him. She's secretly smitten with him for months."
The source also added that Justin has been spending "a lot of time" with Kourtney's three children, Mason, 6, Penelope, 3, and Reign, 1. Previous reports claimed that Justin is a good friend of the Kardashian-Jenner clan and has even babysat Kourtney's kids in the past.
"They've been hanging out a lot and enjoying each other's company, and Kourtney has always spoken about how sexy she thinks Justin is."
It's not just all about the physical attraction between the two hot stars. Another source told the Hollywood Life that Kardashian and Bieber have developed an emotional connection. During their time together, they have connected over their loneliness, which has made their sex life that much better -- and hotter.
"Their emotional connection only makes their sexual chemistry that much more sizzling. And the best part of their relationship is that there is no pressure from either side. Neither of them want anything from the other."
Since Scott is still a big part of Kourtney's life, the news of her hot new romance has him questioning everything from their relationship to her faithfulness. He's accused the reality star of cheating on him before and now he's questioning whether or not Reign is actually his kid, according to a report in OK! Magazine (via Celebrity Dirty Laundry).

Scott Disick, Kourtney Kardashian
[Photo by Dimitrios Kambouris/Getty Images for Dom Perignon]Scott first had these concerns back in September, but with the shocking revelation that Kourtney has been hooking up with Justin for several months, he's back to wondering if she was always faithful to him while he was away partying or recovering in rehab. Although he was caught cheating on Kourtney with his ex-girlfriend Chloe Bartoli, Lindsay Vrckovnik, and countless other women, it wouldn't be entirely surprising if she did step out on him.

What's even more surprising is that Kourtney Kardashian has been spotted with Diddy's stepson Quincy Combs on Wednesday, Dec. 16. In the photos published on TMZ and the Daily Mail, the two were spotted eating at II Pastaio in Beverly Hills. The two weren't entirely alone though. They drove off with a female friend, who sat in the back of Quincy's car, while a source told Us Weekly that he's just a longtime friend of the Kardashian-Jenner clan.

[Photos by Jason Merritt/Getty Images]