The British girl group was singing an emotional new track, called "The End", when it appeared the pain of her recent split from fiance Zayn Malik overwhelmed Edwards, and as she sang the lyrics "And I won't be missing, missing you/And no one can love you, the way I used to do... But love isn't fair" she started sobbing, reported Daily Mirror.
The pop star's bandmates, Jade Thirlwall, Leigh-Anne Pinnock and Jesy Nelson, immediately embraced the emotional Edwards, 22, as she wiped tears away from her eyes.
Little Mix have been on a whirlwind promotional tour.