Originally Posted by kvz5
My impression was their first actual face to face meeting was at the ball. Bruce didn't even know her when she approached him at the ball (he had to guess who she is). Also, both Alfred and Fox were insisting to Bruce that she was "lovely" implying that he hasn't seen her yet.
Don't forget though, she approached him holding the mask to her face, but he still recognized her (or her voice).
Also, Lucius tells Bruce Miranda is lovely after the ball scene, and he has the same annoyed reaction as when Alfred tells him prior.
I would guess that Bruce and Miranda have at least been in the same room before (the Wayne board) even if they haven't had a personal one on one convo until the charity ball scene.