Knight initially balked when “ET” host Lauren Zima asked if he and Rodriguez were married when Knight called Rodriguez her husband.
“We might have, we might not,” the “Step By Step” singer said with a laugh, though Zima later pointed out that he was wearing a sparkly wedding ring.
Knight told PEOPLE last year that he considered eloping with Rodriguez after Covid-19 halted their wedding plans.
The pair is based in Massachusetts, where they film the HGTV series “Farmhouse Fixer.” On the series, Knight renovated farmhouse-style homes for clients that included his mother and extended family, he told “ET.”
Knight recently returned from the New Kids on the Block tour with support from contemporaries such as Salt-N-Pepa, Rick Astley and En Vogue.