During an interview with "Real Housewives of New York City's" Sonja Morgan, Andy Cohen let her pry into his personal life and dig up whom he did the dirty with.

On a recent episode of "Watch What Happens Live," the 46-year-old Bravo host revealed that the most famous person he had sex with was . . . former N'SYNC member Lance Bass!

"This I Promise You," is true.

It was already exposed that the two kissed back in 2012, but it's news about them getting physical.

Bass, 35, married artist Michael Turchin on Dec. 20, 2014, and his encounter with Cohen happened before he met the love of his life.

Morgan delved into Cohen's past, but he welcomed it. When asked about the craziest place he had ever had sex, Cohen replied with "on an airplane," but Morgan wouldn't settle for that response - she wanted something juicier.

Cohen then admitted that he actually did the deed "under the stands at Hollywood High School," Us Weekly reported.

"When's the last time you had sex because I'm very worried about you Andy and your mattress action," Morgan told the host. "I just think you're not getting enough."

Cohen reassured Morgan that he has been getting plenty of action.

"Don't be worried about me," Cohen said. "The last time I had sex was Sunday morning. Today's Tuesday."

Apparently, Cohen has had a fair amount of encounters with other gay male celebrities. "Decades ago," Cohen went out on a date with . . . Anderson Cooper!

"We were set up on a date," he said, according to E! Online. "Not many people know this, but the way Anderson and I met about 20 years ago is we were set up on a blind date. It didn't take. It just didn't work. We're meant to be best friends...We're meant to be good friends and not boyfriends."