with no bra... it gets out of control. my last girlfriend had F's.-_- and she was only like 5'7, 120 pounds. -_________- it actually embarassed me after a while, i didn't want to go anywhere unless a bra was used.
yes clevage is showing so much, yet its not at the same time.
It depends on how big Her breasts are. If she is a D cup and up, then she should be wearing a bra. I think breasts look amazing when they are basically touching one another. I would have to go with pushup bra thats shows cleavage. :D