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Marc Anthony's outdone himself again and wasted NO time doing so -- he scored a model barely old enough to order Jägerbombs, even before his divorce was final.

We're told the 48-year-old singer's been dating Wilhelmina Miami model Mariana Downing for a couple months now after meeting her at a dinner party. Witnesses say Marc was immediately smitten -- because he has eyes -- and they exchanged numbers that night.