Pop star Janet Jackson revealed a saucy secret on a US primetime chat show hosted by Tyra Banks.

Jackson, who is currently dating music producer Jermaine Dupree, confessed to joining the mile-high club during a series of probing questions from Banks.

Initially reluctant to say where the craziest place she has had sex was, Janet Jackson eventually revealed, "On a plane, on an airplane...Commercial."

And when friend Tyra Banks asked whether or not it had been in the bathroom, Jackson began blushing and answered, "No, that's what makes it worse. It was in my seat."