As for the Marie Antoinette connection, it's not a total fantasy either.
Louis XVI gave her The Laiterie at Rambouillet (a dairy farm estate) in 1787 and they chose an Etruscan themed china service which included four mastos-type cups.
There isn't any specific reason to think that they were modeled on Marie Antoinette's breasts per-se - but the fact remains that Marie Antoinette actually owned cups explicitly modeled on a woman's breast - with pearly pink nipples and all.
If Marie Antoinette had modeled a glass on her breast it would have been an explicit classical reference to Helen of Troy. Such a classical connection continues to this day.
As recently as October of 2014 we were treated to a celebrated beauty making a champagne glass modeled on her breast's shape:
81On Wednesday night