Hailey Baldwin Wears See-Through Dress To Party After Justin Bieber Hooks Up With Kourtney Kardashian?

Hailey Baldwin attended Gigi Hadid’s 21st birthday party over the weekend wearing quite the racy outfit.

Following her highly-publicized split from Justin Bieber months ago, Hailey Baldwin stepped out in a fishnet gown, which showed off her legs, tan underwear and bra straps from the back.

Hailey Baldwin shared a few photos of her dress on Instagram, one of which featured the 19-year-old model giving her friend, Hadid, a kiss on the ear.

Also during the evening, as revealed by Hollyscoop on April 29, Hailey Baldwin was seen in other social media photos and videos, and in a photograph shared by Kylie Jenner, she was seen showing off her behind while bent over a couch.

Throughout the party, Hailey Baldwin spent time with the Jenner sisters and the Hadid sisters, Gigi and Bella, and was seen with Drake, as well.

Hailey Baldwin and Justin Bieber dated late last year into early this year before splitting up due to Bieber’s Purpose World Tour. During an interview with GQ in February, Bieber explained that while he and Hailey Baldwin did have something between them, he simply didn’t want to be tied down by any one woman while on tour.

In the weeks following Bieber’s interview, he and Hailey Baldwin were rarely seen together, and a short time later, he began spending time with Kourtney Kardashian, a 37-year-old reality star and mother-of-three.

Bieber and Kardashian faced rumors of a romance before, but in December, after Kardashian was spotted leaving his Beverly Hills hotel suite, they seemed to call it quits as things between him and Hailey Baldwin heated up. Then, weeks ago, a report claimed Bieber and Kardashian were back together and continuing to hook up.

“They have hooked up a few times, including recently. It happens in L.A,” a source revealed to People Magazine weeks ago. “He has met her kids, but they don’t hook up around the kids. It’s on nights when she has help and is able to go out.”

Kardashian is mom to Mason, 6, Penelope, 3, and Reign, 1, from her previous relationship with Scott Disick. She is also the older half-sister of Kendall Jenner, who is one of Hailey Baldwin’s best friends.

“Kourtney is great. Justin thinks it’s cool that she is older and hot. She isn’t clingy and has her own life,” the source continued. “There are no bad consequences for Justin to hook up with her. She is very easy going and just makes it fun for him to be around her.”

Back in December, just weeks before Bieber, 22, and Hailey Baldwin traveled to Anguilla to celebrate Christmas and New Year’s with Bieber’s family, a source spoke out, revealing details about Bieber’s relationship with Kardashian.

“He has had a huge ego boost from hooking up with Kourt. It’s been going on for a few months,” a source told People Magazine at the time. “He is used to being swooned by young girls that have nothing else going on. Kourt is a hot mom with a career… He more thought, ‘Wow,’ and couldn’t believe that she would go for him.’ He brags about how hot she is. He is happy while it lasts. Even if she is using him to get back at Scott, he couldn’t care less.”

Hailey Baldwin and Bieber haven’t been seen together in weeks, and the last known time they were together was in March during one of Bieber’s Los Angeles shows. Oddly, Kardashian was also in attendance.

[Photo by Matthew Eisman/Getty Images for REVOLVE]