Oh you dirty dog!

During an oh-so-steamy episode of Watch What Happens Live, Housewife Sonja Morgan grilled host Andy Cohen when he took someone to the mattress, what's the steamiest place he's had a romp and who's the most famous person he's had sex with? Turns out the answers are: last Sunday, under the bleachers at Hollywood High and -- Lance Bass!

Cohen confessed, "The most famous person I ever slept with I guess is…Lance Bass!”

The Bravo host previously admitted back in 2012 that he'd smooched the married 'N Sync alum. Looks like a lot more than just kissing happened!