Justin Bieber Hooks Up With Kourtney Kardashian, Wakeboards In Underwear For Holiday

Justin Bieber has a packed schedule right now, with the 22-year-old singing superstar immersed in his Purpose World Tour. But when the Fourth of July holiday weekend rolled around, Bieber made sure to take time for everything from partying with Keeping Up with the Kardashians star Kourtney Kardashian, 37, to wakeboarding in his underwear, reported ET.

Prior to going to a nightclub, where he was seen with Kourtney, Justin spent time in Miami Beach for his wakeboarding stunts. What to wear when the wakeboard craze hits?

If you’re Bieber, you combine bright white underwear with a wildly patterned green life vest. And that’s all he needed to enjoy the waves.

Bieber went from waveboarding in his undies to dancing in the DJ booth. He headed to Instagram to show what happened when Rihanna’s “Work” began to play.

Beyond dancing to Rihanna and wakeboarding in underwear, Justin caused fireworks to explode over the July 4th weekend with the reports that he was once again hooking up with Kourtney.

Bieber and Kardashian began dating soon after her split from baby daddy Scott Disick. The singer, 22, and Kardashian, 37, repeatedly have been seen together, with the most recent sighting when Kourtney traveled to Miami for the July 4th holiday with her children. She saved time to spend with her off-again-on-again fling Bieber, a source told People.

“Kourtney is having a fun holiday weekend with her kids. She keeps enjoying the beach and the pool. She has been hanging out with friends, including Justin Bieber and Larsa Pippen,” revealed the source.

Kourtney Kardashian hooks up (again) with Justin Bieber.

Although Kardashian was busy with her offspring from her ex-boyfriend Scott (they have one daughter, Penelope, 3, and two sons, Mason, 6, and Reign, 1), the Keeping Up with the Kardashians star and “Sorry” singer did have some encounters. Bieber was visiting Miami for his Purpose World Tour.

Both spent part of Saturday night at LIV nightclub over the holiday weekend but seemed detached, another source told People. While Justin perched in a skybox, Kourtney was seated in a DJ booth. And Bieber appeared to be trying to keep himself separated from everyone.

Justin Bieber had an explosive Fourth of July holiday weekend.

“He didn’t stay long on both nights and kept to himself – no mic or performance,” added the source.

It was a very different scene on Sunday night, however. Justin and Kourtney were seen together at STORY nightclub. Energized and upbeat for his Purpose World Tour after-party, the pop star ran to the mic to persuade the entire nightclub to croon “Happy Birthday” to the owner, who expressed his thanks on Instagram.

“Now this is the way u wrap up a great weekend. Thanks for the BDAY song @justinbieber,” wrote STORY nightclub owner David Grutman in response to the serenade from the singer.

When Justin disappeared at 1 a.m., he returned soon after leading Kourtney to the DJ booth.

“After wishing David a happy birthday, [Bieber] went right down to her table and brought her up to a private table behind the DJ booth,” revealed the source.

Kardashian sang along with Justin’s songs, while he danced to some of them.

“[Bieber and Kardashian have been] hooking up on and off for a few months now,” a source previously told People in April.

Although the singer has met Kourtney’s children, they avoid hooking up around the youngsters, according to the insider. The two have limited their flings to nights when someone can watch her trio of kids. The insider also revealed why Bieber enjoys hooking up with Kardashian.

“Kourtney is great. Justin thinks it’s cool that she is older and hot. She isn’t clingy and has her own life. 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.”

[Photo by Chris Pizzello/Invision/AP Images]