Justin Bieber & Kourtney Kardashian Hot Hook-Up Causes Scott Disick To Go Wild: Their Affair & His Revenge

Scott Disick sparks concern.

Justin Bieber and Kourtney Kardashian succeeded in keeping their steamy romance a secret for months. But now the 21-year-old pop idol and 36-year-old star of Keeping Up with the Kardashians can’t keep their affair under wraps any longer, and their hot hook-up is out in the open. It all began when Kourtney broke up with Scott Disick in July, according to Us Weekly.

“Justin started hanging out with Kourtney alone because she started going out more,” a source clarified to Us. “Remember, she never really went out before, so he’s been showing her a good time.”

Scott’s problems included partying and rehab stays, leaving Kardashian to stay at home and play the role of single parent to her three children. But with Disick out of the picture and her family coming together to support her, that freed her to experience the joys of partying (minus the boozing for which Scott became infamous).

Lord knows what Scott Disick really thinks about Kardashian's hot hook-up.

With Disick out of the picture, the 21-year-old and 36-year-old felt free to have flirty fun starting at the end of August. They were spotted together at a Hollywood lounge called the Nice Guy as well as Universal Studios’ Halloween Horror Nights.

And it’s keeping it all in the Kardashian family where Bieber is concerned. He met the Kardashians in 2010, at which time he teamed up with Kim Kardashian for a photo shoot. Then Justin had a blast with Kendall and Kylie Jenner, and he sought advice from Kardashian West’s famous husband Kanye when it came to his career.

Add in the fact that the Biebs’ ex-tour manager, Corey Gamble, is involved in a relationship with Kris Jenner, and it’s familiar territory where the pop idol is concerned. He’s even pals with the three children shared by Scott and Kourt, who range in age from a year old (Reign) to 6 (Mason), with Penelope playing the role of the middle child at 3.

“He actually goes over a lot to see her kids, and they love him,” an insider told Us about the pop star.

But for Disick, it’s a cruel reality to see his former girlfriend and mother of his children involved with a 21-year-old pop idol. And he’s reacting in a variety of ways, including some that are sparking concern as Scott returns to the club hosting and partying that made Kardashian dump him in the first place, revealed Hollywood Take.

Most recently, Scott surfaced at 1 OAK L.A. to provide an intro for Chris Brown’s performance. They spent time with 1 OAK partner Darren Dzienciol. In addition, Disick is scheduled to head to Las Vegas for the New Year, where he will have a gig as the host of the New Year’s Eve bash at 1 OAK there.

Scott exited rehab and now plans Las Vegas bash.

Has Scott learned his lesson about staying sober since starting rehab for session number four in the fall? Since his exit from the treatment facility, Disick’s decision to schedule that gig for New Year’s Eve has some fans worried about him. And some of the followers of Lord Disick (LD) are letting Scott know that they think he’s made the wrong move about hosting that New Year’s Eve bash.

And that’s not the only evidence that Scott is reacting in wild ways to the romance between Kardashian and Bieber. Disick reportedly is stalking Selena Gomez, the ex-girlfriend of Justin, according to Hollywood Life.

Scott has been viewing the social media associated with the “Hands To Myself” pop princess and turning from obsessing about Kardashian’s hot hook-up with a 21-year-old idol to obsessing about Selena, a source told Hollywood Life.

“He thinks Selena’s smoking hot and he’s inches close to pushing that ‘follow’ button on her Instagram page and start liking all her pictures,” revealed the source. “He ghost follows her. He’s been creeping through her pages, marveling at how attractive she is. He loves her body and thinks her hair is absolutely perfect – just like his!”

Would Disick go so far as to seek revenge on Bieber by persuading Selena to go out with him, or will he keep it to virtual reality? No one knows what Lord Disick is planning.

Moreover, as the Inquisitr reported, Disick hasn’t let go of that obsession about Kardashian’s hook-up. He reportedly warned her to keep Bieber a certain distance from their children or he will go after her new boy toy.

What do you think about Scott Disick’s reaction to Kardashian’s hot new hook-up? Should he cancel that Las Vegas hosting gig? Post your views below.

[Photo by David Becker/Getty Images]