Amber Heard Under Oath In Johnny Depp Divorce

Amber Heard showed up 1 1/2 hours late for her deposition ... where she'll be in a face-off with Johnny Depp's lawyers over her divorce/domestic violence case.

Amber and her lawyer Samantha Spector showed up Saturday morning at the law offices of disso-queen Laura Wasser's firm, Wasser, Cooperman and Mandles, the firm that's repping Johnny in the divorce. Her client wasn't with her and finally, at around 11:30 AM Amber drove up to the front of the building but didn't want to be filmed so she found a more private entrance.

Our sources say both sides tried hammering out a settlement Friday night but negotiations fell apart at around 9 PM.

As TMZ reported, the depo should last all day and the lawyer doing the questioning -- Blair Berk will almost certainly be interested in Amber's domestic violence claims. Berk will pepper Amber with questions over the fact the police officers who responded to the downtown L.A. loft saw no evidence of physical injury and no damage inside the unit.

The deposition will also cover Amber's demand for money in the divorce. The marriage lasted only 15 months.