Lovate also on Sunday shared a video clip of her performing \"Sober\" during a concert in Lisbon, Portugal. In the video, Lovato appeared to be fighting back tears as she sang, \"I'm sorry for the fans I lost who watched me fall again/I want to be a role model but I'm only human.\"

\"Tonight I took the stage, a new person with a new life,\" she wrote on Twitter. \"Thank you to everyone who has supported me throughout this journey. It will never be forgotten.\"

Tonight I took the stage, a new person with a new life. Thank you to everyone who has supported me throughout this journey. It will never be forgotten ?? @rockinriolisboa pic.twitter.com/cv51ssaqu4

— Demi Lovato (@ddlovato) June 24, 2018

The singer has been outspoken about her battles with bipolar disorder and substance abuse. A former patient turned advocate, she is now co-owner of Comprehensive Assistance Support Treatment [CAST] Centers, a wellness and recovery program that personally helped her during her battle with substance abuse.

\"PHOTO:
Cindy Ord/Getty Images
PHOTO: Singer Demi Lovato visits the SiriusXM Studios, March 22, 2018, in New York City.
>

In March, Lovato celebrated six years sober.

I’m so grateful for all of the 6 year sober birthday wishes... it means more than you know. Truly. Thank you ???? pic.twitter.com/zIr4XeeXVm

— Demi Lovato (@ddlovato) March 16, 2018

But in May, she hinted that there was more to tell, writing, \"I'll share my truth soon.\"

I’m just gonna let my lyrics say it all... new music coming very soon

— Demi Lovato (@ddlovato) May 29, 2018

A rep for the singer did not immediately return a request from ABC News for comment.

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