She said in an interview a while back she wants them bigger.
Which is odd since in another interview, I can't remember who with, she said she didn't want them to be bigger, but that she did once think about reducing them before she gained confidence in them through her modelling career...
OTOH, if she gained confidence in them and in herself through her modelling career it is entirely possible that she could switch her position (heh) on reduction to desiring implants. The problem there is that the very fact she has natural breasts of that size means that she's one of the few models in the world that a lot of men and a number of women don't consider fake in terms of her personality. So getting implants would change the generally positive perception of who she is as a natural (not fake) person with natural breasts which makes her so attractive to a lot of people.