Andy Cohen revealed to "RHONY's" Sonja Morgan on Tuesday's episode of "Watch What Happens Live" that the most famous person he (allegedly) had sex with was Lance Bass.

But there's one issue. The singer says that it isn't true!

Bass mentioned on his SiriusXM radio show "Dirty Pop" Thursday that the two never slept together.

"First of all, I'm not going to tell you what I do in the bedroom," he said, according to E! Online.

"Sex is a broad term...like 'Andy banged Lance' - when did he ever say that? This is an old story. Three years ago we told everyone we hooked up...Now it's getting into who did who? I can just tell you right now, there was no Andy D going in my B."

Though he denied the intercourse aspect of Cohen's tale, we can infer by his response that something happened.

"I'm not going to tell you what went down...but it's not what people are thinking."

The former boy band member did say that he and Cohen are very close, just not in that way.

"We're too great of friends to ever," he concluded. "We didn't know each other that well [back then]. It was like, 'Ah, I wonder if I could date this guy?' It was that kind of thing."