It's Mackenzie Douthit!
Sooo ... yeah ... this is awkward. We always thought Mackenzie was among the more normal of the Teen Mom 3 bunch, but turns out girlfriend is taking care of business in her sink! We can't help but notice that there's a toilet next to Mackenzie in this picture, but let's go ahead and assume it was broken. And let's also hope and pray that girlfriend cleaned this thing out before brushing her teeth in it.