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.

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Ab-tastic: Jennifer Lopez displayed her abs as she stepped out after a gym session in New York on Tuesday

Jennifer was also spotted with her on/off boyfriend Casper Smart, who was equally casual in shorts and a T-shirt.

The pair have been on and off after allegations that he had cheated arose in June 2014.

But they have been spotted together again since this year’s Billboard Music Awards in Las Vegas.

Despite allegedly calling it quits, J. Lo and Casper appear to be either remaining good friends or rekindling the spark.

However, there could be trouble in paradise as according to The Sun, JLo is the reason for Ben’s recent split from wife Jennifer Garner. The site says that ever since they say each other at the Academy Awards, the two have been in constant contact.

Ben and Jennifer were engaged from 2002 to 2004 after starring together in the poorly received Gigli.

A walk on the wild side: Jennifer encased her curvaceous derriere in a pair of cropped leggings

After her high profile romance with Ben, the Booty singer dated and married Marc Anthony.

The couple had two children together but finalized a divorce in June of 2014.

Since then, Jen has been seen with Casper, who was her former back-up dancer.

Meanwhile, the curvaceous movie star is currently in New York to film her new cop drama Shades Of Blue.

Still got it: Before the world knew Kim Kardashian existed, Lopez’s curvy behind was the most famous in the world and Jennifer, 45, showed exactly why she’s the original and best in this outfit

The TV series also stars Ray Liotta, Drea de Matteo and Warren Kole and while 13 episodes have been ordered by the network, there’s no date announced yet for when they’ll start airing.

The gritty NBC drama marks a change of pace for Jennifer who is more familiar to TV viewers as a judge on American Idol and who last appeared on the big screen playing a teacher who falls for a younger man in the erotic thriller The Boy Next Door.

But it’s clearly a change she wanted to make as the diva is co-producing Shades Of Blue in partnership with American Idol host Ryan Seacrest. Her company Nuyorican Productions is overseeing the NBC series with Elaine Goldsmith Thomas and Benny Medina.

Reunited? Jennifer was spotted wit her on/off boyfriend Casper Smart, who she first split from last year