Justin Bieber-Kendall Jenner PDA: Selena Gomez Terms Bieber's Actions 'Immature'

If Justin Bieber and Kendall Jenner's public display of affection at Riccardo Tisci's birthday party was meant to make his on-again, off-again girlfriend Selena Gomez take notice, then they have succeeded in doing so.

Reports have it that Kendall and Bieber were all over each other at the party in Ibiza, Spain, on Aug. 1, and as proof of their close relationship, Kendall Instagrammed various pictures of Bieber hanging out with her, as well as her family members, including Kim Kardashian and Kris Jenner.

And if Bieber thought that he would manage to get Gomez jealous by encouraging Kendall to post such pictures, a source noted that it had the opposite effect.

"Selena is beyond over Justin and his immature behavior. She knows very well that he is trying to make her jealous with all the pics he's been posting of him with other girls, including Kendall," a source revealed to HollywoodLife.

"But rather than making her feel hurt or making her miss Justin, it's back firing. She's disgusted with how he's behaving," the source added. "She's not hurt, she's actually grateful that she's not with him anymore. In her opinion, he's acting out and she would rather have nothing to do with him."

Interestingly, Kendall is not the only model that Bieber has been hanging out with lately. Bieber was recently spotted having a good time with former flame Chantel Jeffries, who is also a model. He has also been linked to Yovanna Ventura, a Miami-based model.

It is not immediately known if Kendall and Bieber are embarking on a romantic relationship, but a Sun source noted that Bieber and the Kardashians go way back.

"Kendall and Justin were inseparable for most of the night. Justin has always been good friends with the Kardashians, so he and Kendall go way back. As soon as Justin arrived he made a beeline for Kendall the moment he spotted her," the source said, according to Channel 24.

Reportedly, they were flirting throughout the night, and were laughing and teasing each other a lot. The pair also left together after nearly two hours of partying, and were seen holding hands, the source noted.

Bieber's Instagram also features photos of him with Kim and her husband Kanye West. The Canadian singer also posed for a snap with Kris, and he had his arms safely wrapped around the Kardashian-Jenner momager.

He captioned the snap: "@kendalljenner @kyliejenner who's your daddy."