Justin Bieber Cozies Up to Kendall Jenner: Selena Gomez 'Disgusted' by Singer's 'Immature Behavior'

Selena Gomez is reportedly unimpressed with ex-boyfriend Justin Bieber's public display of affection with Kendall Jenner at Riccardo Tisci's birthday party in Ibiza, Spain.

The Baby singer posted an intimate picture with the 18-year-old Keeping Up With The Kardashians star on his Instagram.

"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. They were seriously flirting and kept going in and out of a photobooth together. There was lots of laughing and teasing and they were taking endless selfies," a source told the Sun.

"After partying for about two hours they quietly slipped out of the party together and were seen holding hands," the insider added.

In April, Gomez spent some time with Kendall and Kylie Jenner at the Coachella Valley Music Festival.

However, within few days the 21-year-old former Disney star unfollowed everyone on her Instagram, including her best friend Taylor Swift.

"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 told Hollywood Life about Bieber and Kendall's PDA.

"But rather than making her feel hurt or making her miss Justin, it's backfiring. She's disgusted with how he's behaving," the insider 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."