She told Hot Stars magazine: "They are like a good necklace. And I don't mind that my boobs have shrunk a bit. Too many men used to wind up staring at them anyway."
The singer/actress has also hit out at stars who go out partying without their pants, reports The Sun.
Jessica said: "I don't understand what's going on with that. I'm the kind of girl who always puts my hand between my legs when I'm getting out of a car if I'm wearing a short skirt."
"I always wear underwear. It's a personal rule."