Remaining members Ally Brooke, Normani Kordei, Dinah Jane Hansen and Lauren Jauregui will continue the group as a foursome.

Fifth Harmony has announced that singer Camila Cabello has left the group.

In a message posted on social media and signed by "Ally, Normani, Dinah and Lauren," the group writes, "After four and a half years of being together, we have been informed via her representatives that Camila has decided to leave Fifth Harmony. We wish her well."

The remaining members, Ally Brooke, Normani Kordei, Dinah Jane Hansen and Lauren Jauregui, state that they will continue the group as a foursome.

As recently as December 9, when the iHeartRadio Jingle Ball tour hit New York City, the group had announced plans to release a new album. Kordei told radio personality Elvis Duran, "2017, it’s going to be popping" and Jane Hansen added, "The third album is definitely going to be so lit. We're really excited.”

After forming on the second season of the American version of The X Factor in 2012, Fifth Harmony released two albums beginning with Reflection in January 2015. That album included "Worth It," their first Top 20 hit on the Billboard Hot 100 chart last summer; the quintet would surpass that milestone with "Work From Home" feat. Ty Dolla $ign, the lead single to sophomore LP 7/27, which peaked at No. 4 on the Hot 100.

While the 7/27 tour brought 5H on their first international trek this year, Cabello had hinted at pursuing solo material through two successful collaborations. "I Know What You Did Last Summer," a duet with Shawn Mendes, became a Top 20 hit upon its release in late 2015. "Bad Things," a Machine Gun Kelly single featuring Cabello, has done even better, reaching No. 10 on the Hot 100 as of last week.

Although other members had expressed interest in solo careers -- Jauregui released a collaboration with pop duo Marian Hill earlier this month -- Fifth Harmony had long assured fans that a breakup or member departure was not imminent.

But insiders suggest that tensions between Cabello and the other group members had long been festering. In fact, December 18, the day the split was announced, marked the conclusion of Cabello's contractual obligations to the group and offered an exit, says a source.

Billboard has reached out to Cabello's representative for comment.</s>Camila Cabello has left Fifth Harmony to pursue a solo career but said the girl group shouldn’t be surprised by her departure.

Cabello wrote in a statement posted on several on social media sites that she has repeatedly talked with the other group members about her plans to focus on a solo career.

Her post came hours after other Fifth Harmony group members released a statement on Twitter early Monday saying they were just informed of her plans. They said the group will continue as a quartet.

“We are four strong, committed women who will continue with Fifth Harmony as well as our solo endeavors,” the group wrote in a statement.

Both sides wished the other well.

Cabello’s statement reflected on private moments the group shared, and thanked fans for their support.

“New chapters are scary, but conforming to what’s safe and looking back with regret would be even scarier,” she wrote.

Fifth Harmony was formed on the second season of the “The X Factor” in 2012 and scored its biggest hit last year with “Worth It.”

Cabello has been branching out on her own with collaborations with Shawn Mendes on “I Know What You Did Last Summer” and a duet with Machine Gun Kelly, “Bad Things,” that reached No. 10 on the Billboard Hot 100.</s>Fifth Harmony has announced that Camila Cabello has decided to leave the girl group.

The group released a statement on Twitter early Monday confirming Cabello's departure and wishing her well.

The group will continue on as a quartet. The statement says, "We are four strong, committed women who will continue with Fifth Harmony as well as our solo endeavors."

Fifth Harmony was formed on the second season of the "The X Factor" in 2012 and scored its biggest hit last year with "Worth It."

Cabello has been branching out on her own over the past year. She collaborated with Shawn Mendes on "I Know What You Did Last Summer," and her duet with Machine Gun Kelly, "Bad Things," reached the No. 10 spot on the Billboard Hot 100.</s>The popular girl group announced this Monday that Camila Cabello has left the 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," they said in a statement posted on social media. "We wish her well."

The group formed in 2012 after finishing in third place on the American version of "The X Factor."

They have released two albums and won several accolades, including Artist to Watch at the MTV Video Music Awards in 2014 and Collaboration of the Year at the 2016 American Music Awards for their single "Work From Home" with Ty Dolla $ign.

The four remaining members -- Ally Brooke, Dinah Jane Hansen, Lauren Jauregui and Normani Kordei -- said they will continue as a group. "We are four strong, committed women who will continue with Fifth Harmony as well as our solo endeavors," they said in their statement. "Harmonizers, we are in this together." Cabello appears on Machine Gun Kelly's song, "Bad Things," which has gone gold.</s>if only they'd high fived her https://t.co/V0YMTn1kUB
Fifth Harmony announces Camila Cabello's departure from the group.