I read some article awhile ago about how she is fiercely protective of her private life and of her husband’s private life, too, but they both still manage to go out in public and have a normal life. IIRC, the article even mentioned that can just walk down the street of her hometown in normal clothes and doesn’t get recognized.

You don’t need voluminous boobs if you can squish ‘em in the right ways and get them to stay held there. (Witnessed with my own eyes from a friend - similar bra, different cup/band sizes, very different profile.) I would not be the least bit surprised to learn she uses the same tricks, plus the wigs and makeup to keep her personal/private life separate.