Kourtney Kardashian Flaunts Revenge Body As Hailey Baldwin Wears Bikini, Talks Selena Gomez Feud & Justin Bieber

Kourtney Kardashian is proud of her revenge body. After devoting hours to the gym and sticking to her diet, Kardashian decided to show off the results of her hard work by stripping down and slipping into black leather, reported E News.

Flaunting her fab abs, Kourtney went for a strapless black crop top with cut-outs, complemented by extra-short shorts, sky-high boots, and a choker. And what happens in Vegas doesn't stay in Vegas if you're a Kardashian, because the Keeping Up With the Kardashians star, 37, was in Las Vegas at the grand opening of the Jewel nightclub at the Aria Resort & Casino.

Kardashian has been faithfully exercising since she had her third baby, Reign Disick, 1. Her son's father is Kourtney's former boyfriend, Scott Disick.

"So @kourtneykardash not only took us away for a fun girls night in Vegas but also taught ALL of us girls that you can actually look BETTER after having 3 kids," pointed out her hairstylist Jen Atkin.

And while he wasn't at the nightclub, Kourtney has been hooking up with 22-year-old pop star Justin Bieber since her split from Scott last summer, according to the Mirror.

Justin Bieber and Kourtney Kardashian have been hooking up.
Justin Bieber and Kourtney Kardashian have been hooking up. [Photo by Frazer Harrison/Getty Images for Desert Smash]Apparently her little sister Kylie Jenner feels that Kardashian should move on from Bieber, because she signed up Kourtney to a dating app, Bumble.

"I think [Kourtney's] gonna kill me if I read her text messages, so I think I'm gonna sign her up for Bumble," confessed Kylie. "I think she needs to be on Bumble."

Kardashian made it clear that she's used to getting teased by Jenner.

"What was is this? These are the photos you pick?" retorted Kourtney.

While Kardashian and Kylie sort out which man can measure up to Justin, Hailey Baldwin stripped down to her bikini amid reports that she's feuding with Selena Gomez over Bieber.

While the "Sorry" singer was earning praise at the Billboard Music Awards, his on-again off-again girlfriend Hailey was playing in her bikini in Florida, noted Extra.

As for those reports that Baldwin is immersed in a feud with Selena over Justin? Hailey denied it.

"I think it sucks that people try to start things like that. There's never any truth to that, first of all," emphasized Baldwin. "[Selena is] a lovely girl. She's very kind. Her and I have a lot of mutual friends and it's all cool between everybody. We run in the same circles."

Are Hailey Baldwin and Selena Gomez feuding over Justin Bieber?
Are Hailey Baldwin and Selena Gomez feuding over Justin Bieber?[Photo by Pascal Le Segretain/Getty Images]But are Bieber and Baldwin still dating? Justin has expressed his desire to avoid hurting her.
"I've hurt people and said things that I didn't mean to make them happy in the moment. So now I'm just more so looking at the future, making sure I'm not damaging them. What if Hailey ends up being the girl I'm gonna marry, right? If I rush into anything, if I damage her, then it's always gonna be damaged. It's really hard to fix wounds like that. … I just don't want to hurt her."
As for how Baldwin feels about Justin, she caused Twitter to go wild recently by tweeting a photo of the Biebs, pointed out Yahoo.

Hailey shared a picture showing Jerry Lorenzo Manuel flaunting a cardboard cutout of Justin. The cryptic caption, "mood," caused her fans to demand more details about whether she has rekindled her romance with the pop star.

But Baldwin played coy when asked for specifics about just why she wrote "mood."

"Honestly, I just said 'mood' because I thought it was funny and it's just, like, an inside joke," insisted Hailey. "It wasn't like 'mood' in any type of 'let's read into it this' way!"

Too late now. Team Jailey (Justin + Hailey) fans urged Baldwin to stay with the Biebs, while others recommended she continue her single-and-free-to-mingle status.

[Photo by Evan Agostini/Invision/AP]