Leona Lewis anunciou que o novo single de Glassheart é o tema Fireflies! A cantora revelou que é um tema muito especial para ela e tem uma grande mensagem!!

Leona Lewis has announced that the next single off Glassheart is Fireflies. She said:
I'm about to tell you the next single from Glassheart is going to be fire... 'Fireflies'. This song is really special to me, really important and has such a meaningful and powerful message behind it. I think in the run-up to Christmas it's going to be a really powerful song. I'm just really excited about it.