Courtney Stodden's Husband -- 'Couples Therapy' Co-Star Calls Him a 'Child Molester'

17-year-old Courtney Stodden's 52-year-old husband is a "child molester" -- at least that's what one his "Couples Therapy" co-stars called him on set last week ... and it's creating massive tensions among the cast.

The show began filming last week -- and sources tell TMZ, when Courtney's husband Doug Hutchison introduced himself to TheDirty.com's Nik Richie ... Richie refused to shake his hand.

According to sources, Richie then called the guy a "child molester" and refused to say another word to him.

We're told Doug was deeply offended by the remark and has been extremely upset since. The standoff has created a rift among the cast.

FYI -- Doug married Courtney in Vegas last year ... when she was just 16. Courtney's mother had to sign a consent form permitting the marriage because Courtney was under 18 at the time.