1980s Pop Star Tiffany Outs NKOTB's Jonathan Knight As Gay

Eighties pop star Tiffany publicly outed New Kids On the Block member Jonathan Knight late last week -- but she claims she "really didn't know that was the wrong thing to say."

While appearing on Bravo's "What What Happens Live" late Thursday night to promote her upcoming Syfy movie with Debbie Gibson ("Mega Python vs. Gatoroid"), Tiffany fielded saucy questions from host Andy Cohen.

Video: Tiffany Casually Outs NKOTB's Jonathan Knight on "Watch What Happens Live"

"Did you have anything [romantic] with any of the New Kids on the Block?" Cohen asked Tiffany in regards to her former tourmates.

She casually mentioned that she dated Jonathan Knight, "the quiet one, the shy one," adding that "he became gay later." Commenting on her role in "turning him," Tiffany continued:

"I had issues with that! I was thinking maybe I did [turn him]. But no, now looking back when we were dating, he was so much fun -- we used to do facials together, he was so easy to talk to."

Knight addressed the outing via his Twitter account, saying: "I'm so devastated. How can I not remember getting facials???????"

After Tiffany expressed distress over the incident on Twitter, Knight responded: "Tiff, please don't lose any sleep over it!" he responded. "I know you weren't being mean and I found it to be funny!"