Scott Disick has waged a war against his baby mama Kourtney Kardashian, Breaking Celebrity News has exclusively learned.

As Breaking Celebrity News reported last week, the protective mother of three, 37, threatened her ex — who has been on a month-long boozy bender — by claiming she planned to go for full custody of their three children: Mason, 7, Penelope, 4, and Reign, 2.

But Disick, who was photographed with his children over the weekend, isn't taking her threats lying down, a source close to the Kardashian clan revealed.