The heavily-pregnant star, who was once called "sexual napalm" by ex-boyfriend John Mayer, says: "I'm kinda unstoppable at the moment."
And Jess admits sex has never been better.
But Jessica, who is due to give birth next month, reveals she "freaked out" after suffering a false labour recently.
She said: "I had contractions last night and I freaked out a little bit. You know those Braxton Hicks things.
"It's like these contractions that pregnant woman have towards the end. It prepares your body for delivery. I'm prepared. It's scary. It's like: 'Oh God, this can happen right now'.
