The singer, who has battled issues including bipolar disorder, is set to headline the show in Los Angeles on Wednesday (18Mar15), and she has now added a host of friends to the bill.

Jar of Hearts star Perri will also perform, while Lovato's ex-boyfriend Jonas has agreed to DJ on the night. Other acts added to the bill include singer/songwriter Bea Miller and rapper Sirah.

The gig at L.A.'s Troubadour venue raises money for the Lovato Treatment Scholarship Programme, which helps to fund mental health treatment.