Justin Bieber posted a sad Christmas message on Instagram while rumors suggest he is dating Hailey Baldwin and Selena Gomez is upset at her ex-boyfriend's relationship with the model as she is said to be talking to Luke Hemmings-is it possible for the couple to get back together?

"Selena is trying very hard to pretend that she isn't upset about Justin and Hailey, but the truth is it's killing her," a source told HollywoodLife.com.

"She's having a major breakdown. It's putting such a dark cloud over the holidays."

Selena Gomez has signed a new record deal with Interscope Records, opening the possibility for her making new songs about her dating relationship with Justin Bieber.

Last week she posted a photo on Instagram of herself spending time with Jennifer Aniston, with some fans suggesting that she may have received advice about her relationship with Justin Bieber.

She also posted several pictures of herself wearing a new ring, which is believed to be a gift from Justin Bieber.

Her leaked "My Dilemma 2.0" and "Do It" songs have spurred rumors on Instagram and Twitter that they were released for publicity as her relationship with Justin Bieber remains unclear.

Some time ago, Justin Bieber unfollowed Selena Gomez on Instagram, giving many the impression the couple is fighting over their dating and break up controversies.

Selena Gomez was featured in a new music video where she discusses her relationship with Justin Bieber, sparking rumors on Instagram and Twitter that it may have been their break up song.

"Everybody wants to form their own opinions anyway. I think the biggest problem I had this year -- even with [Justin] and on his side -- is identity," she says in the video.

"I was trying to figure out what I'm doing, and that was the first time I was constantly being kicked down for doing that."