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Before the world knew Kim Kardashian existed, Jennifer Lopez's curvy behind was the most famous in the world. 

And Jennifer, 45, showed exactly why she's the original and best as she left a gym in Southampton, New York on Tuesday, displaying her behind in a pair of leopard-print leggings.

Jennifer also showed off her rock hard abs in a tied-up tank top as she emerged from the building with a huge smile on her face, no doubt thanks to a mixture of endorphins and how good she looked.