Us Weekly says he did.
Their new issue, which comes out today, says it has confirmation from "five people close to the situation" - including two relatives of the other woman that "Jon & Kate Plus"
dad Jon Gosselin, 32, has been having an affair with third grade school teacher Deanna Hummel.
Here's the alleged mistress' brother, who is also her roommate, comments:
"She's a nice girl, not a homewrecker," Jason tells Us Weekly. "He is a bad
liar. This isn't healthy for her. But she is refusing to help herself, so here I am trying to help her myself. I hope this clears the air."