I think if I were going to attempt to broach the subject in any way these days, I would actually attempt to avoid complimenting her on her huge boobage, and instead focus on something else. Just to see what happens next, I suppose.
For example: compliment her hairstyle, or eyes, or the particular dress she's wearing. And I don't mean an empty compliment for the sake of complimenting her, I mean a genuine compliment resulting from being inspired.
Also, I'd have to be in the right frame of mind to do this. Either deeply into the zone, so that I'm about as far away from being interested in fishing for some sort of go-forward dialog, or sufficiently deep into my cups that the social filters have been made more pliable, but not so deep into my cups that I come off like a total douchecanoe.