Amber Rose has filed for divorce from husband-of-1-year Wiz Khalifa … and she’s gunning for full custody of their kid … TMZ has learned.

In the divorce docs — obtained by TMZ — Amber says they split on Monday and cites irreconcilable differences.

Amber is asking for full legal and physical custody of their 1-year-old son Sebastian. She’s willing to give Wiz visitation… (Continued)