Demi Lovato tears up onstage while celebrating six years of sobriety

Demi Lovato just celebrated a major milestone with her fans.

The "Skyscraper" singer teared up during her concert at the Barclays Center in Brooklyn on Friday, March 16, 2018, as her opening acts, DJ Khaled and Kehlani, led the audience in a special rendition of "Happy Birthday" in honor of her marking six years of sobriety.

"Yesterday was a really big day for me," she told the crowd in a video captured by a fan. "Yesterday, six years ago, I was drinking vodka out of a Sprite bottle at nine in the morning, throwing up in the car and I just remember thinking, 'This is no longer cute. This is no longer fun. And I'm just like my dad.'"

Lovato, whose Tell Me You Love Me tour currently includes free group therapy sessions for fans, continued, "So I made changes in my life. The reason why I became so open about my story is because I know that there are people here tonight that need to ask for help and I want them to know that it's OK. Mental health is something that we all need to talk about and we need to take the stigma away from it. So let's raise the awareness. Let's let everybody know it's OK to have a mental illness and addiction problem. I'm bipolar, whatever. I take care of myself."

"I can never say thank you enough to you guys for the support that you've given me over the years," she added. "And you've forgiven me for my mistakes. So thank you for being a part of saving my life. I love you guys."

As Nicki Swift previously reported, Lovato took to Twitter on Thursday, March 15 to celebrate the occasion. "Just officially turned 6 years sober. So grateful for another year of joy, health and happiness," she wrote. "It IS possible."

The following day, she and her mother, Dianna De La Garza, opened up about their family's mental health and wellness journey on Good Morning America. "The very first thing that you have to do is admit that you have a problem and then you have to ask for help and you also have to know that it's possible," the "Heart Attack" hitmaker advised. "I want people to know that it was possible to get help and to recover. … People will help you."