Long time ago, I downloaded a video from her website which was recorded very early in the aforementioned pregnancy, just as her breasts had swollen to nearly their largest, fullest size, during the famous "Lindsey Dawn growth spurt". She was lying on her back on a bed with her top pulled up, and she was sloshing her breasts back and forth on her chest. I use the word "sloshing", because they jiggled and rolled around like two water balloons being rolled back and forth on a table, suggesting no firmness to them whatsoever. It was an effect that could not possibly be duplicated by any known kind of breast implant. I am thusly convinced by the video evidence that said breasts are fully natural, their girth a product only of genetic predisposition, hormonal surges (and maybe the effect of birth control medication), and a diet including plenty of fat and sugar.
She is no longer my favorite nat-tittied model, but hers are still the most perfect breasts ever photographed.