Halle Berry and Gabriel Aubry -- D-Day in Custody War

It's decision time in Halle Berry's custody war with Gabriel Aubry -- the two just walked in to an L.A. courtroom where a judge will decide once and for all if Halle can move to France with Nahla.

Halle and Gabriel have been at war for months ... with Halle claiming their daughter Nahla will be safer in France because of stricter paparazzi laws.

Gabriel has called BS ... claiming it's unfair for Halle to take his daughter thousands of miles away, making it extremely difficult for him to be a part of Nahla's life.

The judge ordered both parties to court today so he could deliver the news to them face-to-face.