Busty Belle has been one of my favorite porn stars for a long time. I was not that into Kimberly Kupps (her implants are seriously on the ridiculous side), but I met her once when she was dancing at this shabby-chic strip club in Fayette-Nam. She was incredibly nice. The place was about empty, and she talked to me and my buddy for quite a while between sets. She always plays the hard-ass, but was incredibly sweet. According to Busty Belle, hers are natural. From what movies I have seen with her, I imagine they are, as they are highly mobile :-)
BTW: Busty Belle is the red head and Kimberly Kupps is the blonde. There will be more pictures of both at Flickr here. Some are hardcore, so beware (also, Flickr might kill them).