Demi Lovato Performs 'Sorry Not Sorry' at iHeartRadio Music Festival 2017

Demi Lovato makes a surprise appearance at the 2017 iHeartRadio Music Festival on Saturday night (September 23) in Las Vegas.

The 25-year-old entertainer came out during DJ Khaled‘s set to perform her hit song “Sorry Not Sorry.”

Earlier in the day, Demi attended the Global Citizen Festival in Central Park, New York City, where she was named the Mental Health Ambassador for Global Citizen.

“It’s an honor to be the new Mental Health Ambassador for @glblctzn Excited for the pilot program we have planned with @SavetheChildren in Iraq!? SWIPE LEFT,” she captioned a slideshow on Instagram.

FYI: Demi is wearing a pink Greta Constantine dress with Casadei sandals. She is wearing a Faustian Steinmetz jacket and pant, a Yummie bodysuit, and Public Desire boots.

Click inside to read Demi’s full note and see photos from both of her appearances…

“I am so proud to partner with Global Citizen as their official ambassador for Mental Health with focus on vulnerable communities around the world. With their support and our combined platforms, I will be able to further my work around some of the issues I deeply care about as it relates to mental health and well-being around the world.

In October 2016, I, along with my friend and partner Mike Bayer, went to Kurdistan to visit one of the biggest refugee camps in the world. The experience of meeting with some of the displaced families, and my encounter with a very young girl who told me all she wants is to just be happy (what a simple and yet completely out of reach wish), will stay with me for the rest of my life.

As a first step in my partnership with Global Citizen, over the past year we have worked to identify the right partner who will help us bring a bit of a solace and peace to some of the displaced children in Iraq. We will be bringing Save the Children’s HEART program (which offers healing, psychologial support, and basic education through the arts) there this year.

The trauma that displaced families and children all around the world feel from losing not only their homes, but also some of the people closest to them, is unfathomable and has long lasting impacts.

My hope is that this program can bring at bit of comfort to those who need the most. This isn’t about politics or race or religion. It’s simply about humanity and protecting one another.”