Drama alert! Teen Mom 2 star Jenelle Evans is not holding back when it comes to her second baby daddy's girlfriend, Ashley Landhart. The 25-year-old took to social media to post a scathing review about Nathan's current flame, who is an employee of a drug addiction treatment center.

She wrote, "DO NOT GO HERE! Make sure Ashley Landhart is not your addiction counselor. I had to report her for accusing myself of being on drugs and my fiancé. This counselor got on social media posting horrible things about myself." Yikes.

MORE: Barbara Evans Slams Jenelle's Tell-All Book and Basically Calls Her Daughter a Liar

Now Nathan is firing back, slamming his baby mama — who is the mother of their son Kaiser, 3. He told Radar Online, "I, however, am very disappointed. Ash never made a direct tweet nor did she accuse Jenelle of being on drugs. I’m just appalled how an individual can stoop so low. I shouldn’t be astonished though because there have been many times Jenelle crosses that line of moral consciousness." He added, "She told my brother she wished he died in combat. She made reference of my brother’s best friend’s death in combat. She was battering and bullying my best friend online, ruining a great relationship and bond for almost two years (we have reconnected since then)."

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MORE: Nathan Griffith Accuses Jenelle Evans of Child Abuse in Series of Vicious Tweets

Today, Jenelle is engaged to David Eason, who was her ex-husband Courtland Rogers' prison cellmate. Although she seems to be in a happier place these days — now that she's sober — Nathan insisted the old Jenelle is apparently still ready to unleash at any time.

Nathan continued, "Even though I could go on, throwing my girlfriend’s kindness back in her face when she has reached out several times to her to come to a resolution. Then, continued to talk crap about Ashley just because she was defending the person she loves online. Then, Jenelle carries on to mess with that woman’s job. I am very distraught that once again, a woman has to face the wrath of my ex fiancée for the simple fact of being associated with me." Ouch. Here's to hoping these two can work things out for the sake of their son.

Teen Mom 2 airs Mondays at 9 p.m. EST on MTV.

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Scroll through the gallery below for photos of Jenelle's body transformation!