Jennifer Lopez displays her rock hard abs and famously curvaceous derriere as she hits the gym in leopard-print leggings 

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 

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

Go for mellow yellow in Jennifer's Asics running shoes

If there's anyone who can make us actually want to hit the gym it's J.Lo. Making us dream of getting a booty like hers in a pair of leopard print leggings and white tank top, J.Lo breezed out of the gym looking happy and relaxed.

While we love J.Lo's roaring leggings, we're also loving her bright yellow trainers which keep the outfit summery and fresh. The yellow, white and gray running shoes are from Asics and make the ideal sports trainer due to their gel cushioning system. Jennifer's exact color way is nearly sold out but you can shop similar running trainers on the Asics website to the right.

Alternatively, if you like the idea of a mellow yellow pair, then shop our picks below with gym-ready styles from Reebok, Adidas and Nike. A stylish trainer like this will make sure you hit the gym with your best foot forward.

* PRICES MAY NOT BE AS ADVERTISED

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 

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 

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 

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

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