I hadn't noticed but i think you're right. Might be the angle of her stance. I don't think she got a boob job though, I was always under the impression that she's natural. From what I recall she tried to get into the music biz by doing religious songs but it was hard for people to take her seriously as an Christian singer because of her boobs. She would go into auditions wearing sweaters to try to play them down.

Go fig.