Fifth Harmony's Camila Cabello revealed the pop group will get together on Sept. 21 to record their second album. This is good news for fans of the group anxiously awaiting their next favorite song.

During an appearance at the Sept. 19 iHeartRadio Music Festival, Cabello talked to Billboard, telling the magazine that Fifth Harmony was preparing to begin recording the follow-up to "Reflection" in Los Angeles this week.

"We've heard some of the demos and we're really, really excited about some of them," Cabello said. "They're really, really cool. I heard one the other day that I was like, that was probably my favorite song that we're gonna record."

The group has seen a lot of success with several of their pop singles. The song "Worth It," which according to Popcrush went multi-platinum, has been their biggest success to date. Cabello says the group owe this accomplishment to their fans because it was their love of the song that gave it flight.

"They requested it on the radio stations and they were so driven for us to have a successful song on the radio," said the 18-year-old. "We have a really, really passionate core group fan base and I think they just worked that. They were just on it."

The star also got fans talking when she posted a photo on Instagram of her and Shawn Mendes, whom she is rumored to be dating, backstage at the festival looking cozy with one another.

The singer captioned the photo with, "@shawnmendes and i are in desperate need of caffeine. #iheartradio."

Cabello and Mendes have been friends for a while, but recently sparked rumors of possibly being involved romantically when they shared flirty tweets and attended a 2015 MTV Video Music Awards after-party together.

Watch Cabello's full backstage interview at the iHeartRadio Music Festival with Billboard below.