Pop singer Demi Lovato says she's "in a great place" mentally after battling bipolar disorder and drug and alcohol addiction for years.

In an interview on NBC’s Today show, the 22-year-old "Heart Attack" singer and celebrity spokesperson for the new “Be Vocal: Speak Up for Mental Health” campaign says she decided to open up to raise awareness and help others.

"I've been very open about my story just because that the more honest and open I am, the more people that I'm gonna be able to reach," Lovato says. "Mental illnesses, in general, are...not talked about as much as they should.

"I wish that more people could understand from a point where it's not a choice to have an addiction. And with bipolar disorder, it's a chemical imbalance and it's something that you have to figure out your own treatment with your own team and in order to do that, it takes time. And finally, I'm in a great place where I can say that recovery is possible."