Jennifer Lopez and Iggy Azalea -- Cheek to Cheek ... A Heavyweight Battle

J.Lo & Iggy Cheek to Cheek ... A Heavyweight Battle

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Jennifer Lopez and Iggy Azalea teamed up for a remix ... which is totally irrelevant when compared to the amazing photo that has ass aficionados stacking the vintage model against the new one.

So, who would you rather -- dream about? 'Cause realistically, ya got no shot.

Jason Momoa -- Banging to Stay in Shape :: tmz-on-tv-3