yep, they are fake!
She admitted it w/o actually admiting it.

"Right now me and the girls, we are pretty much getting a lot of attention. I like to keep it a mystery. Let the mystery live on because as soon as I say yes or no then no one is going to care anymore."

http://evilbeetgossip.film.com/2007/03/02/did-kellie-pickler-have-boob-j...