I've met two famous porn stars who are busty. I'm not sure if I'd call them 'big-tit superstars.' They are porn superstars with big tits, but maybe not superstars in the world of big tits...Does that make sense?
I met Shyla Stylez at a feature appearance at a strip club. She was pretty wild. I bought a lap dance from her and she let me feel her boobs.
A year later, I met Kagney Linn Karter at an appearance at an adult video store. I mentioned to her how the rules are strange with these adult appearances and conventions, how nudity isn't allowed. She picked up the hint and broke the rules for me by taking her boobs out for the polaroid with me.
This post is kind of useless without pictures. I'll try to edit it later to show who I am talking about.