By all appearances, Teen Mom 2 star Kailyn Lowry has totally moved on from her ex, Jo Rivera: She married another man, Javi Marroquin, last year, and gave birth to a son by him, Lincoln, just six weeks ago. But she just can't quit her baby daddy drama! Earlier this week, Lowry revealed that she and Rivera are still tussling over their four-year-old son Isaac's custody, after Jo recently violated the original agreement.

The feuding fired up again in recent weeks when Rivera told Lowry that he'd moved in with his girlfriend, Vetzabe Torres. "There's a little bit of drama with that," Lowry told Wetpaint.com earlier this week.

But when fans on Twitter accused Lowry of making something out of nothing because of jealousy, she wrote, "Actually that's something huge. And it's a requirement in our custody agreement."

Rivera currently gets custody of the four-year-old from Thursday to Sunday every other week, but Lowry revealed he's "still fighting me on that."