Saw her on muffia.com and has to say her boobjob was well-done... Not to big, seems very natural...
Anyway, i used to watch her with small & natural tits and generally prefers her that way... Those who will discover Christina with her enhanced boobs and who prefer big tits probably will have a different opinion cos' she looks great right now.. Personnally, i was always much more focused on her big beautiful asian ass!
And it's not some kid who is unsecure about herself, she is around for some years and she looked hot, she probably just had the desire to shape herself into something still sexier.
Plus these implants look very natural, not like some women who blow themselves up to insane levels or those hal-grapefuit that look like Barbie Doll.