Keeping Kids Away! Kourtney Kardashian Confronts Scott Disick About 18-Year-Old Rebound Girlfriend -- Inside Their Explosive Fight

Last weekend, on the real life version of Keeping up with the Kardashians, Scott Disick flaunted his hot new 18-year-old Canadian model girlfriend – Lindsay Vrckovnik – all over the beach in Miami. Because that is how The Lord rolls.

But a source close to the Kardashian clan tells RadarOnline.com exclusively that is NOT how Disick’s estranged ex Kourtney Kardashian rolls!

“She made it very clear to Scott that he is not to bring this girl around their kids,” says source. “Those kids are already having a really tough time without their dad being there as it is, and the Kourtney told him that the fact that he is even dating a barely legal girl is absolutely disgusting!”

According to the insider, “Scott told her that he is single and he is allowed to date who he wants.”

As RadarOnline.com previously reported, the mother of Disick’s three young children – Mason, 5, Penelope, 2, and 9-month-old Reign – has transformed her body since Disick publicly humiliated her by cheating with his ex-girlfriend Chloe Bartoli.

Kardashian’s hard work has not gone unnoticed as Disick still continues to hold on to hope that she will return to him.

That is not going to happen.

“Kourtney just wants him out of her life, but she knows that is not ever possible because he is the father to the three most important beings in her life,” the source adds.

“Mason knows that his dad and mom are not together anymore. He gets it. But Penelope still thinks he is coming home because that is what Scott tells her.”

What’s even worse is that Disick, 32, is a “total hypocrite,” the insider tells RadarOnline.com.

“Scott talked so much sh*t on Tyga for dating Kylie when she was only 7 years younger and he went off on how Kris Jenner and Corey’s relationship because of their age gap.”