#TBT Demi Lovato In Birmingham For #SorryNotSorry

Demi Lovato graced us all in Birmingham, Alabama with her presence at Iron City ONE YEAR AGO today. What started out as a "Silent Disco" for her release of "Sorry Not Sorry" turned into a surprise from the pop star herself.

The curtains parted and the fans lost their minds (to say the least). Demi debuted her new single first followed by "Confident", and closed the pop-up show with "Cool For the Summer".

To be honest, the coolest part looking back on is when we noticed 103.7 The Q's surprise "Silent Disco" was featured in her documentary video, "Demi Lovato: Simply Complicated - Official Documentary". A preview of it was shown on Ellen, too! Peep the video below at 0:11.