Poor Scott Disick!

Less than one month after the KUWTK star reconciled his relationship with longtime girlfriend and baby mama Kourtney Kardashian, the 37-year-old revealed that she's pregnant with her fourth child. But sources exclusively told In Touch that Kourtney isn’t sure who the father of her baby is because she’s been hooking up with a younger boy toy, former boxer Younes Bendjima.

The news hit Scott hard, who's been working so hard for more than a year to get his family back together.

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“Scott hit the roof when he heard she was hooking up with Younes,” an insider told In Touch.

Kourtney and Younes first sparked dating rumors back in October during Paris Fashion Week. But now, the pair is adding fuel to those rumors after Kourtney was spotted out with the 23-year-old Algerian model on Dec. 16 — right after she got into a fight with Scott. She was seen leaving the SLS hotel in Beverly Hills with Younes, and tried to sneak into her car before she was caught by the paparazzi.

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“Kourtney has a thing for boy toys, and Younes is just her type,” the insider continued. “She’s been boasting to pals about his amazing six-pack, telling them she can’t keep her hands off his sexy body.”

But the mom-of-three — she shares seven-year-old son Mason, four-year-old daughter Penelope and two-year-old son Reign with Scott — is known for being a cougar. Kourtney is four years older than Scott, and Younes is 14 years her junior.

MORE: Kourtney Kardashian Shares Sexy Instagram Post — See the Photo!

She also sparked dating rumors and controversy when she was seen hanging out with 22-year-old Justin Bieber last year, just a few months after her last breakup with Scott.

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For more on this story, pick up the latest issue of In Touch — and scroll through the gallery below to see Kourt and her baby daddy's cutest moments together!