'Southern Charm' Stars Kathryn & Thomas Battle For Custody Of Their Kids!

Kathryn Dennis has turned into a fiercely protective mama bear!

The Southern Charm star is fighting her baby daddy, Thomas Ravenel, for more time with their children in their increasingly bitter custody battle, RadarOnline.com has exclusively learned.

The parents of Kensie and Saint were back in mediation to determine who will care for the toddlers — but the previously friendly negotiations exploded last week.

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Currently, an insider told RadarOnline.com, Dennis shares 50/50 custody with Ravenel, but she doesn't think it's nearly enough.

“Kathryn wants almost full custody of her little ones," the insider noted. "She wants a 75/25 split."

Dennis lost custody of the children after failing a drug test, but a source told RadarOnline.com she had passed “at least two” other tests that were ordered by Ravenel in the past year.

Ravenel and Dennis were at one point able to have each other's back; they put on a united front after multiple women came forward and accused Ravenel of sexual misconduct.

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Ravenel was accused of assaulting Debbie Perkins in 2015. According to her daughter, he ultimately paid Perkins a $200,000 settlement.

A former nanny also claimed he sexually assaulted her in his home.

At the time, Ravenel posted two videos dancing with Dennis, and she shared a picture of them together at their daughter’s dance recital.

But Dennis refuses to go easy on her ex in their custody fight.

“Kathryn is going hard at Thomas to give her more time with the kids — she’s not going to take no for an answer,” the show insider said.