There's no guarantee now that Kourtney Kardashian and Scott Disick will get back together after the former's hook-up with Justin Bieber has been revealed. Latest reports say that Lord Disick gave his ex an ultimatum to not let the Canadian singer get close to his children, Mason, 6, Penelope, 3, and Reign, 1.

Scott, 32,  warned Kourtney, 36, to keep their children away from the "Sorry" singer or else she would be in trouble. Hollywood Life reveals that Scott isn't disappointed with Kourtney and Justin's romance; the former troubled star just feels embarrassed for her. Scott reportedly would not intervene in their relationship, but the Calvin Klein model must learn how to keep himself away from Scott's kids.

"Scott is definitely embarrassed that Kourtney is hooking up with Justin. But he feels Kourtney should be even more embarrassed. He can't control her and if that's what she wants to do he can't stop her," a source revealed.

Meanwhile, there are speculations that Kourtney and Scott may spend Christmas together after Kris Jenner invited the latter in their yearly Christmas Eve bash. It looks like the father of three is planning to attend the event, despite Kourtney and Justin's hook-up revelation. An insider also revealed to OK! Magazine that the 32-year-old is planning to see his three kids on Christmas Day.

About Scott's feelings on Kourtney and Justin affair, "Of course it stings a bit that Kourt is hooking up with Bieber. But Scott also knows his place and that he doesn't have the right to have a fit about it," an eyewitness said of Scott. "He is convinced Kourt is doing it to hurt him. And she succeeded."

Do you think Kourtney and Scott will spend Christmas together for the sake of their kids?