Southern Charm's Kathryn Dennis has admitted she had an abortion while with ex Thomas Ravenel, but clarified it was before she entered rehab, DailyMail.com can reveal.

Dennis fired back at the father of her two children, Kensie, 5, and Saint, 3, in the latest filing of their explosive custody battle, weeks after Ravenel accused her of having an alcohol, prescription drug and shopping problem.

Dennis, whose mother Allison Calhoun Dennis died aged 59 on Wednesday, began dating 56-year-old Ravenel in 2013.

The 27-year-old writes in her affidavit that she learned she became pregnant with a third child by Ravenel in early 2016. At the time, the on-off couple had briefly reconciled following the birth of their son Saint in November of 2015.

But their relationship broke down again, with Dennis stating: 'This time, I did not believe that Thomas and I would ever get back together... I didn't think we could handle a third child. Accordingly, I had an abortion in February of 2016.'

The revelation comes weeks after Ravenel's legal team claimed Dennis entered rehab to hide having an abortion, as Dennis battles for sole custody after Ravenel was accused of sexual assault by the couple's former nanny, Dawn Ledwell.

Southern Charm's Kathryn Dennis has admitted she had an abortion while with ex Thomas Ravenel, but clarified it was before she entered rehab, DailyMail.com can reveal

Dennis, who began dating the 56-year-old in 2013, writes in her affidavit that she learned she became pregnant with a third child by Ravenel in early 2016. At the time, the on-off couple had briefly reconciled following the birth of their son Saint in November of 2015

Dennis admitted to having the abortion in February 2016 after briefly getting back with Ravenel.

Dennis writes in court papers filed in Charleston, South Carolina on June 26, that after having the abortion in February, her regular menstruation period returned in May.

Acknowledging a dependence on marijuana to deal with stress and depression, Dennis entered a 30-day rehab program in Malibu in June of 2016, according to court papers.

According to court filings, she was suffering from cannabis abuse, alcoholism, amphetamine use disorder, self-harm and major depression.

While there, she claimed she learned there was complications from her abortion and needed a procedure to stop the excessive bleeding she was experiencing.

She writes: 'I was diagnosed with Menorrhagia, and had to have a D&C procedure to remove the uterine lining buildup and a mass left from the February procedure.

'This medical complication arising from the February abortion occurred while I was in rehabilitation, but I still finished the 30 day program and was discharged. I was not pregnant while in rehabilitation.'

Dennis wrote in court papers after their relationship broke down once again in early 2016: 'This time, I did not believe that Thomas and I would ever get back together... I didn't think we could handle a third child. Accordingly, I had an abortion in February of 2016.' Pictured: Dennis in February of 2016

Dennis filed for sole custody last October in the wake of allegations of sexual assault made by the couple's former nanny against Ravenel

Dennis denies in her affidavit that she is currently battling a prescription drug and alcohol problem, an accusation brought on by Ravenel's legal team.

She claims she has 'not used any illegal drugs since 2017,' according to court papers.

However, Dennis does admit to taking doctor-prescribed prescription drugs and taking CBD oil products, but claims she has since quit CBD products.

Dennis admits to not handling her finances well, writing in her affidavit: 'I freely admit to lacking knowledge in regard to my financial matters.

'Accordingly, I have hired Elliot and Davis CPAs to help me with preparing, filing and paying what is currently owed for prior tax returns.

'I estimate that I will easily owe in the range of $100,0000 - $150,000 of back taxes when I get prior tax returns filed in the foreseeable future.'

In July, Ravenel filed legal papers that accused the mother of his children of being addicted to prescription medications, marijuana, alcohol, shopping and sex.

The filings were an attempt to show Dennis as a negligent mother, mentally unstable, heavily medicated, sexually active with multiple men and hopelessly reckless with her finances.

To add salt to the wounds these documents appear designed to inflict on his ex, Ravenel claims that he had believed that Dennis had 'truly rehabilitated herself,' and was 'ready to share fifty-fifty time…and help financially support her life with Kensie and Saint.'

Now, he states, he views the prospect of her gaining even joint custody as, 'terrifying.'

But, had she not filed this custody action, Ravenel states,'I would never have known how at risk Kensie and Saint are in Kathryn's care.'

The Southern Charm star makes the shocking claims against his ex in a trove court documents in what appears to be a character assassination, pictured outside of court in February

In July, Ravenel filed legal papers that accused the mother of his children of being addicted to prescription medications, marijuana, alcohol , shopping and sex. In undated text message Lara Dawson, a friend of Kathryn's, appears to try to buy Adderall illicitly on Kathryn's behalf

t reads: 'I have Kathryn here at my house in a f***in full panic attack mode - she has been on Adderall since 14 and her ex stole her entire bottle….I told her I would do everything I possibly could to get her covered and she will come to you and pay you well'

Dennis' history of drug abuse is well documented but, according to Ravenel and his team, it is not - as she would have people believe - a thing of the past.

Last month she failed a mandatory blood test that is part of their current custody agreement, testing positive for marijuana, benzos and amphetamine.

Ravenel's expert witness, forensic psychiatrist Dr Timothy Brewerton lists a staggering 17 diagnoses ascribed to Kathryn's mental health issues including bi-polar, ADHD and PTSD. He goes on to list 17 medications she has been recently and/or is currently being prescribed.

He concludes that she is continuing to take both 'uppers' and 'downers' and states, 'Multiple medications for similar complaints indicate either that the patient is not taking the medication as prescribed or not suffering from the complaint they are prescribed for.'

In undated text message Lara Dawson, a friend of Kathryn's, appears to try to buy Adderall illicitly on Kathryn's behalf. It reads: 'I have Kathryn here at my house in a f***in full panic attack mode - she has been on Adderall since 14 and her ex stole her entire bottle….I told her I would do everything I possibly could to get her covered and she will come to you and pay you well.'

Kathryn is now publicly dating country singer Hunter Price and Ravenel takes issue with the fact that Price has been staying overnight when she has the children in the house

Elsewhere, a prescription for Adderall in addition to her regular amount includes the prescribing doctor's notes, 'Reports meds were stolen when she was in New York. She's been out of meds for 3d. Only Adderall was taken.'

Ravenel also takes issue with Dennis' current boyfriend country singer Hunter Price.

In a text from Ravenel to Kathryn dated March 2019 Ravenel brings up that Price has been staying overnight when she has the children in the house.

This is in breach of their custody agreement that states that no 'paramours' will stay overnight unless they are married.

In his affidavit Ravenel claims, 'I wouldn't have such a problem with Hunter living with Kathryn if I felt that Kathryn was capable of being in a healthy, long-term relationship.

But according to Ravenel the opposite is true and her 'hyper sexuality' was an issue in his own relationship with her.

He claims that when she was pregnant with Saint 'she hooked up with one of my polo players on a weekend we spent together with Kensie in Aiken.'

In her affidavit, Dennis acknowledged Price staying over, but claimed he slept on the sofa and he has since not stayed over while the children are in her care.

According to Ravenel the chaos of Kathryn's existence is reflected in her spending which, he presents, as excessive and out of control.

He claims that she owes 'hundreds of thousands of dollars in back taxes' and has not filed since 2015 despite making a six-figure salary during those years.

Kathryn has disputed this saying she has retained an accountant and is in the process of filing.

He claims that she spent $85,000 on hair, make-up and clothing in 2018 and $90,000 in 2017. From June 2017 to October 2018 she spent $34,000 on traveling.

He points out that she rented a house in downtown Charleston for $6,600 and recently had to move out, as she could not afford it. And that she 'attempted to purchase a Rolls Royce for $125,000.'

This, and everything else that he has learned during discovery, Ravenel states, 'gives me serious concern for her ability to meet basic needs and provide our children with a stable environment.'