Little Mix All 'Grown' Up at Apple Music Festival: Watch the Song Premiere 

Little Mix perform on stage as part of Apple Music Festival at The Roundhouse on Sept. 22, 2015 in London, England.  

The headlines from day 4 of London\'s Apple Music Festival could have been about Little Mix opening for One Direction -- the onetime group of Perrie Edwards\' ex-fiance Zayn Malik -- but instead, fans are talking about the British girl group\'s brand-new empowerment anthem "Grown."

Little Mix Makes \'Magic\' on Billboard + Twitter Top Tracks Chart

, and was co-written by Jess Glynne (Clean Bandit\'s "Rather Be"). "Grown" seems to have been written for the person who was never noticed when they were younger but deserves a second look now. It\'s yet another girl-power song from a band that seems to have picked up the torch from the Spice Girls.

"Grown" comes on the heels of latest single "Black Magic," which peaked at No. 67 on the Hot 100.

The Official U.K. Singles Chart Aug 01, 2015 1 Black Magic Black Magic Little Mix

Billboard Canadian Hot 100 Sep 26, 2015 53 Black Magic Black Magic Little Mix

Pop Songs Oct 03, 2015 24 Black Magic Black Magic Little Mix

Billboard Twitter Top Tracks Oct 03, 2015 21 Love Me Like You Little Mix

Austin Mahone Crashes the Billboard Office for \'Dirty Work\'

Watch Jason Derulo Go Through \'Want To Want Me\'

Watch Natalie La Rose Show Her \'Somebody\' Moves