Dwight Howard is off the market ... because he's engaged to rapper Amy Luciani.
The pair went public with their relationship Friday and it looks like they've been together for a while ... because they're already engaged.
PUTTIN' A RING ON IT Instagram / @amylucianiworld
Amy posted video showing their sparkling, diamond engagement rings on social media ... and the footage shows Dwight admiring Amy's bling as they party in a nightclub.