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Fifth Harmony might reconsider changing their name to Fourth Harmony.

The pop girl group took to Instagram late Sunday evening to announce that Camila Cabellohas left the chart-topping group. 

"After 4 and a half years of being together, we have been informed via her representatives that Camila has decided to leave Fifth Harmony," the statement read. "We wish her well."

It continued, "You Harmonizers have been there with us since the beginning, you've supported us, and with your love and support, we will continue on. That being said, we are excited to announce that we will be moving forward with the four of us- Ally Brooke, Normani Kordei, Dinah Jane and Lauren Jauregui for our fans. We are four strong, committed women who will continue with Fifth Harmony as well as our solo endeavors."

"We are excited for our future, and we can't wait for what the new year brings. Harmonizers, we are in this together. We love you with all of our heart," their lengthy message concluded.

Within minutes, fans flocked to the comments section noticeably distraught about Camila's surprise exit. But as longtime Fifth Harmony listeners know, it's been quite a turbulent year for the singers.

In a May 2016 interview with Billboard, the 19-year-old pop star explained that she's certainly faced her fair share of fame-related struggles. "I was having terrible anxiety, nonstop...," Camila explained. "I was scared of what would happen to me, of the things my brain might tell me. I realized the stuff I thought was important isn't worth my health. Now I write in a diary every day, work out and meditate."

Then in early September, Cabello left in the middle of a concert after suffering from "too much anxiety." She later apologized, and rejoined Fifth Harmony at their next performance one day later. 

Camila Cabello

Instagram

Discord between the young ladies seemingly came to a head earlier this year when Lauren asked to switch spots with Dinah Jane during a red carpet event, an incident that pushed her to speak out on the matter after facing criticism from internet trolls.

Likewise, Normani and Camila also had to clear the air on an alleged feud going on between them after Kordei seemed to shade her fellow group member in a Facebook Live chat. Only days later, Kordei deleted her Twitter account amid racist cyberbullying.

And just last week, Jauregui issued an apology for missing their Brazil tour pitstop. Jauregui's absence came shortly after she was stopped by TSA at Washington Dulles International Airport after a staffer discovered marijuana in her carry-on luggage. An attorney for the girl band and Jauregui told E! News that she was not arrested.

Fifth Harmony formed  during the second season of The X Factor. Since then, the group has commanded the charts with singles like "Work From Home" and "Bo$$," having won three MTV Video Music Awards and one American Music Award.

They most recently performed Sunday evening at Y100's Jingle Ball in Miami. Cabello did perform onstage with her former bandmates as well as alongside Machine Gun Kelly during a separate duet. 

E! News has reached out to Cabello's rep for further comment.