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Jada Pinkett Smith might think the Oscars slap saved her marriage to Will Smith -- but hubby seems to be singing a different tune in FL ... where he's rolling with her lookalike.

The actor's been spotted out in Miami these past few days for Art Basel ... and between Thursday and Friday, this mystery woman has been tagging along with him and his crew -- and yes, she's a dead ringer for Jada ... with kinda the same shaved-head look/'do.