“A girl can dream!” That’s how Khloé Kardashian captioned an Instagram video of her newly single sis Kourtney sitting next to Scott Disick at Kylie Jenner’s 21st birthday bash. But for Scott’s girlfriend, 19-year-old Sofia Richiewho wasn’t invited to the family gathering — the thought of Scott reconciling with Kourtney is more like her worst nightmare

“Sofia is furious that Scott and Kourtney are hanging out again,” spills a source close to the amicable exes, who share three children, Mason, 8, Penelope, 6, and Reign, 3 told Life & Style exclusively. “She understands that they have to remain civil for the kids but has become convinced that Kourtney is trying to steal back her man.”

scott disick and kourtney kardashian kylie

“She recently reached out to her and told her to back off!” As Life & Style reported, the Keeping Up With the Kardashians star, 39, has been leaning on her baby daddy, 35, since splitting from boy toy Younes Bendjima. “Scott’s caught in the middle,” says the source. “He loves Sofia but will always have a soft spot for Kourtney.”

Now that Younes is out of the picture, fans are speculating that she and Scott will reignite their romance, even though he’s seemingly still smitten with Sofia — especially since Scott opened up about the possibility of getting back with his baby mama during the Season 15 premiere of KUWTK. “We always said we’d try to get back together when we’re 40,” he revealed. We’ll see what happens! 

For more exclusive celebrity news, be sure to pick up the latest issue of Life & Style on newsstands now.