Credit: Twitter

Wetpaint Entertainment stopped by MTV Studios in November 2012 for Teen Mom 2's press day, where Jenelle Evans told us exclusively that she was 100 percent clean and sober. "I've been sober for eight months now," she dished at the time. But according to the events in last night's episode, which was filmed in September 2012, the math just doesn't add up...

In Teen Mom 2 Season 4, Episode 11 (airing on April 22, 2013), Jenelle spiraled into a deep depression and asked her boyfriend Kieffer Delp to buy her some "dope." We didn't actually see her use the drugs on-screen, but Jenelle has admitted on Twitter that she was, in fact, abusing heroin.

When we noticed the discrepancy in the timeline of her sobriety, we tweeted at the starlet to see if she could clear things up.

"I said while I was on probation I was sober for 8 Months. August of 2011 - April of 2012," Jenelle wrote. "Last nights episode was from Sept. 2012."

Well that certainly clarifies things. Although we feel slightly betrayed that Jenelle wasn't exactly crystal clear about her current state of sobriety during our interview, we can't help but empathize with her. Press days can be stressful and overwhelming, especially for someone who got hooked on hard drugs just a couple months prior.

But the good news? Jenelle has finally taken a vested interest in her health, and told us on Twitter that's not only taking multivitamins and melatonin, but her weight is back on track and, best of all, she's sober.

Are you surprised to learn that Jenelle was abusing hard drugs in the fall of 2012? Tell us your thoughts below.