Jo Rivera Goes OFF on Kailyn Lowry: She Kidnapped Our Kid!

Sure, there was the spat over Lowry paying Rivera child support, but for the most part, these two have gotten along swimmingly.

And when Jo married Vee Torres earlier this year, Kail was on hand to wish the newlyweds well.
But that was then, and this is now -- and it looks as though Lowry and Torres' relationship has once again hit the skids.

At issue is Kail's frequent vacations to Hawaii with friend and co-star Leah Messer.
The ladies usually bring their offspring along for the ride, and that's where Lowry rubs Rivera the wrong way:

“Kail took Isaac to Hawaii on June 30, even though Jo was scheduled to have him on the 4th of July from 9 a.m. to 5 p.m.,” a source close to Teen Mom 2 tells The Ashley's Reality Roundup.

“If Jo chose to file contempt on her, and Kail was found in contempt, she could be fined or even put in jail."

All of this has put MTV in an awkward legal position: