Fifth Harmony star Camila Cabello bounced back from her Friday night (02Sep16) anxiety attack by rejoining her bandmates onstage in Dallas, Texas on Sunday (04Sep16).

The 19-year-old unexpectedly walked off mid-show at the girl group's tour stop in St. Louis, Missouri, on Friday, shortly after performing Boss.

Her bandmates, Ally Brooke, Normani Kordei, Dinah Jane and Lauren Jauregui, pressed on with the gig as a foursome, and on Saturday (03Sep16), Camila took to Snapchat to apologise to fans for her absence, explaining, "Hi Missouri, sorry I couldn't finish the set last night. Was having too much anxiety and couldn't finish it. I love u (sic). I'm truly sorry."

However, the Cuban-born singer appeared to be in better spirits on Sunday as she prepared for Fifth Harmony's gig in Dallas.

"Dallas, I'm so excited to see you," she posted on Twitter before the show.

She later returned to social media to thank fans for their support after making it through to the end of the band's latest tour stop.

"Thank u guys for all the love, I love u so much," she tweeted on Sunday night. "Dallas u made my heart so happy tonight. Thank you."

It's not clear what sparked Camila's anxiety problems during Friday's performance, but she hinted at exhaustion in the lead up to the Missouri concert, writing, "Just wanna (sic) sleep for 3 days".

The teenager will be able to catch up on her much-needed rest in a few days' time, as the girls are scheduled for a two week break from 11 September (16), according to E! News.