Selena Gomez Not Invited to Justin Bieber Birthday Party Amid Niall Horan Rumors?

Justin Bieber is reportedly planning a huge party to mark his 20th birthday and insiders claim Selena Gomez is not invited.

The pop star turns 20 on March 1 and insiders claim he has invited many close friends and family to his big bash, but Gomez, who he dated for three years, did not make the cut. Bieber is said to be upset after learning about the former Disney star's rumored romance with Niall Horan, which is why he does not want her present on his birthday.

"Justin is planning a huge party for his 20th birthday and he has not invited Selena," an insider told HollywoodLife.com.

"He does not want her there after she dissed him by hooking up with Niall, which was not cool according to Justin," the source explained adding, "It's going to be off the hook."

Bieber and Gomez, 21, split last year due to alleged trust issues on her part, however, they maintained a friendship up until January when the "Heartbreaker" singer began dating model Chantel Jeffries. Gomez was reportedly crushed over Bieber's new found romance, which prompted her to move on with Horan, 20.

The "Come and Get It" singer, and the One Direction star were spotted enjoying a dinner date in London earlier this month which sparked dating rumors and Bieber was not impressed, despite his relationship with Jeffries.

"Justin feels like Selena is totally dissing him by hooking up with Niall," a source told HollywoodLife.com adding that he is "terrified of ultimately losing the best thing that ever happened to him."

In January, Bieber and Gomez sparked reconciliation reports after they were photographed riding segways together, but he abruptly moved on with Jeffries.

"He has a double standard. It's alright if he hooks up with other people, but not if Selena does," another source said.