Not very big by BEA standards but nicely busty in the rest of the world. 
Big enough to be be a Trophy GF who will be , even if you are in Vegas or South Beach or the Santa Monica pier she will be at least a cup size or two bigger than almost every other guys arm candy
But not so big that that it is a constant "circus side show" type of thing which for me and most guys, even ones who like women in the F to H range would get real old real quick