Selena Gomez Canceled Festival Performance, But BFF Demi Will Take Her Place

Speculate wildly about the ups and downs of Selena Gomez and Demi Lovatos friendship if youd like I cant stop you and, more importantly, I wont stop you but Demi is stepping up in a major way for her former Barney &Friends co-star.

Selena, who spent the summer traveling for her Revival World Tour, recently announced shed be taking some time off to tend to her personal well-being.

She told PEOPLE,

As many of you know, around a year ago I revealed that I have lupus, an illness that can affect people in different ways. Ive discovered that anxiety, panic attacks and depression can be side effects of lupus, which can present their own challenges. I want to be proactive and focus on maintaining my health and happiness and have decided that the best way forward is to take some time off.

Time off means the 24-year-old will be unable to appear at theGlobal Citizen Festivals fifth annual advocacy show September 24 in New Yorks Central Park, PEOPLEreports.

Demi graciously joined the lineup, which includesRihanna, Kendrick Lamar, Metallica, Usher, Chris Martin and Ellie Goulding, to cover for her BFF in need.

The pop star said,

The Global Citizen Festival combines music and activism in a way that inspires and affects millions around the world. I am proud to support this amazing organizations ongoing efforts to improve global healthcare and to end extreme poverty.

The festival is thrilled to have Demi on the roster, as well.

Global Citizens founder and CEO Hugh Evans stated,

Demi has been an incredible ambassador for global health and gender equality campaigns for many years. We are so thrilled to align her artistry and advocacy and have her join us as a headliner

As Selena recuperates, she can watch along at home on MSNBC, or YouTube beginning at 3 pm EST the day of the festival.

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