Selena Gomez is reportedly threatened by Kourtney Kardashian's relationship with Justin Bieber. The Keeping Up With The Kardashians star was linked with the Sorry singer in December, following her split from long-time partner, Scott Disick.

Rumours suggest that Selena and Bieber are dating again, especially after the two expressed mutual appreciation of each other's photos on Instagram in March. The 22-year-old singer had shared a throwback kissing photo with Gomez, which the Same Old Love singer liked and wrote: "Perfect". Late last month, Gomez also attended Bieber's concert at the Staples Center in Los Angeles.

According to Inquisitr, Kourtney also attended the singer's concert. She was also spotted leaving Bieber's hotel room in Beverly Hills, California in December. Moreover, she was also spotted at the singer's birthday bash in Los Angeles, which further fuelled the rumours.

"Justin promised Selena he was going to end his relationship with Kourtney, but he hasn't done it yet," a source told Life & Style, according to HollywoodLife. "He told Selena she needed to be patient."

"She [Selena Gomez] knows they have no boundaries. She does not want to have a confrontation with that family [Kardashians]," the source said and added, "She sees Kourtney as a threat, but she and Justin have so much history between them. Selena knows Justin will always pick her in the end."

Nonetheless, when they were reunited at the iHeartRadio Awards on 3 April, Bieber reportedly ignored Gomez completely. "They keep playing mind games with each other because they both want to wear the pants when it comes to a relationship," the insider said. "As much as they want things to happen again, it's easier to play these games."