JON Gosselin isn’t stepping out on his wife — at least not with Deanna Hummel.

The 23-year-old was the mystery woman photographed with the married “Jon & Kate Plus 8” star, driving his car late at night last week, sparking speculation that the two are having an affair.

“We’re just friends, it’s absurd that anyone would think otherwise,” Hummel tells People.com.

“He’s a very nice guy, don’t get me wrong. But he’s married with eight children.”–