This might be because of the voters, which will probably be women, who only know the celebs that are featured in In Touch Weekly.
Also to be honest you need to see breasts when they're naked, without support, to judge them :)
So here's a Post Game post:
Some additions of the top of my head, taking into account that they must have been in a movie or have made songs, so taking out most fashion models, nude models, centerfolds, porn stars (Amy Reid for sure), celebs from the past, ...
linked names lead to NSFW proof
my number 1:
Diora Baird (Wedding Crashers, The Texas Chainsaw Massacre: The Beginning, Big Day tv series, upcoming Star Trek): pic from movie
Hot Tamale, yes those are real,
NSFW 1,
NSFW 2Heidi KlumGisele BundchenShannon ElizabethSalma Hayek Tricia Helfer (Battlestar Galactica)
Keeley Hazell (probably in the upcoming Baywatch movie) (pic from movie
Cashback)
Monica BellucciJessica BielMariah CareyKim KardashianChristina Aguilerasome French stars:
Laetitia CastaAudrey Tautou (Amélie)
Ludivine Sagnier (Swimming Pool)
and one classic that I couldn't keep from you:
Elle Macpherson in the movie Sirens (blonde is Portia De Rossi btw) although
recent pics proof that this 44yo still probably has nicer breasts than some on that list
remember there are plenty more