Danielle Derek fits the description perfectly. Almost something you would see in a fantasy cartoon. Wiry tiny body, and giant tits. They are obviously fake, but they still lok great...
Crissy M and Catalina Cruz. Hmm, have they ever been together?
One of my absolute favorites is Diora Baird. She's a natural 32DD with breasts that look really good for their size. I don't think I've ever seen another girl with natural proportions as near to Barbie as her.
http://www.idontlikeyouinthatway.com/pictures/20070425/diora baird playboy/db3.html