#ProtectiveMama. Kourtney Kardashian is reportedly furious with her ex and baby daddy Scott Disick — who took their kids on his spring break trip to Mexico with girlfriend Sofia Richie. The couple is currently in Cabo San Lucas with Mason and Penelope, despite Kourtney’s concerns about his relationship with the 19-year-old model.

“Kourtney and Scott had a major blowout fight over him taking the kids on a spring break trip to Mexico with his girlfriend Sofia,” a source told Hollywood Life. “Kourtney thinks it is entirely inappropriate for Scott to take the kids on international trips with his too-young girlfriend.”

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It doesn’t help that Scott has a history of hard-partying below the border. “It is one thing for them to go out to dinner in Beverly Hills for the evening, but Kourtney was furious when she found out their plans to leave the country for days on end, to a place where Scott is notorious for getting out of control,” the source added. “Despite Kourtney’s disapproval over the trip, Scott took the kids along with Sofia anyway.”

However, Kourtney, 38, can’t complain too much. She is currently on a romantic vacation of her own with 24-year-old boyfriend Younes Bendjima. The couple has been documenting their road trip across California on social media, with Kourtney captioning a recent Snapchat of the Algerian model driving, “Keeping me safe.”

Previously, Life & Style reported that Kourt was warming up to Sofia — but their kids, including youngest son Reign, are still a sore topic. “Kourtney is giving Sofia credit for turning Scott into a better man, and more importantly, a better father,” an insider said. “She’s happy that Scott’s priorities have shifted from nightmare party animal to reliable baby daddy.”

The source continued, “[Kourt] doesn’t really care how or why Scott turned over a new leaf as long as he stays that way and doesn’t slip back into his old routines.” Let’s hope they can all be one big happy family!