Justin Bieber & Kourtney Kardashian ‘Cuddly & Huggy:’ Kendall Jenner, Selena Gomez, Scott Disick Protest Affair

Justin Bieber is thrilled to be involved with older woman Kourtney Kardashian. But while the 21-year-old pop star is boasting about his hot hook-up with the 36-year-old reality TV star, his ex, Selena Gomez, and her ex, Scott Disick, have been stunned and angry to the point of trying to cause a break-up.

Selena has been texting Justin, even telling him that she thinks his romance with Kourtney is incestuous because he used to date one of the Keeping Up With The Kardashian clan, as the Inquisitr reported.

And while Gomez obsesses about Bieber’s amorous affair, Disick is going off the rails with rage over the romance that Kardashian is enjoying. Scott considers it both embarrassing and infuriating to have his former girlfriend and baby mama loving life with a younger, wealthier, more famous man.

As for Bieber, he’s delighted with his hot hook-up with Kourtney to the point of bragging and boasting, according to Us Weekly, which quoted two separate sources about the flirty fling. Those insiders revealed that the 21-year-old is kissing and telling all over town, informing his friends about all the details of his affair with Kardashian, as well as getting very touchy-feely amid texting each other constantly.

Justin Bieber enjoys hot hook-up with Kourtney Kardashian.

“Justin bragged to friends recently that he has been hooking up with Kourtney Kardashian,” revealed the first source.

“Oh, yeah, that’s definitely happening and has been for some time now,” confirmed the second insider. “Every time Kourtney and Justin are together they’re extremely flirtatious. They text each other all the time.”

But it doesn’t stop there. Kardashian also headed to a Beverly Hills hotel frequented by Bieber recently, where she didn’t exit until 4 a.m.

Justin is a familiar sight when it comes to the Kardashians and Jenners. He’s spent time with the three children that Kourtney and Scott share. And that’s not making Disick a happy camper either.

Scott has issued an ultimatum ordering Bieber to stay away from the kids, as the Inquisitr noted.

Although Kardashian originally tossed Scott out the door because he had an affair with someone much younger, Disick views it as humiliating to see Kourtney behaving in a way that he considers childish. And Scott is laying down the law as far as Bieber spending any time alone with any of the children that they share, or making any attempt to take on a fatherly role with Reign, Penelope, and Mason.

Justin Bieber flaunts fab abs: Can Scott Disick be jealous of that ripped body?

With Selena and Disick both trying to dissuade the romance between the pop idol and Kourtney, two new celebrities have joined the Halt Kardashian And Bieber bandwagon. Kendall Jenner and Hailey Baldwin also want to end the affair, according to Hollywood Life.

Kendall and Hailey are BFFs, so when Jenner decided it was time to put a stop to the seduction between Kourtney and the Biebs, she persuaded Baldwin to give her a hand (or two).

“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,” an insider revealed to Hollywood Life.

Justin Bieber has been boasting about his romance with Kourtney Kardashian, and Kendall Jenner isn't thrilled.

But Bieber and Kardashian are having so much fun that the pop star may not care what Kendall, Hailey, Disick, or even Selena thinks about the new hook-up. An insider described to People just how affectionate Justin and Kourtney have become.

“It’s been a deep flirtation for months. He’s obviously close to the family,” pointed out the insider. “This young guy is into [Kardashian], he thinks she’s hot and she’s older. She just wants to have fun… they’re cuddly and huggy.”

As to how long the hook-up has been going on, it’s lasted several months this far, with Kardashian and the Biebs being “super touchy feely” at a West Hollywood hot spot, according to People‘s sources.

[Photo by Xaume Olleros/Getty Images for Calvin Klein]