Jennifer Lopez vs. Iggy Azalea WHO'D YOU RATHER?

0826_jennifer_lopez_iggy_azalea_booty_ratherIt's a battle of the booty!

Here's Jennifer Lopez showing off her 45-year-old bulbous backside (left) posing with 24-year-old Iggy Azalea's down-under donk (right) in a photo promoting their upcoming remix together.

"Oh my god, Becky ..."

The question is ...