Sia talks 'blessing' of motherhood after adopting 2 sons: 'I'm in heaven'

Sia's sons are both now 19, having been adopted at 18.

Just weeks after Sia revealed she adopted two sons last year, the singer is opening up about her experience as a mother.

"It's a blessing for me," Sia, 44, shared on "Good Morning America" Friday. "For me, I think they saved me, so I'm in heaven."

The Australian pop star's sons -- both of whom we have yet to see and whose names we don't yet know -- were 18 when they were welcomed into her home. They are now both 19.

Upon announcing the news for the first time, Sia also noted that she adopted them as they were set to age out of the foster care system. With her, they could get the help they both needed.

They both suffered a lot, and I've been able to get them the help -- I have the resources to get them the help that they needed for their early trauma," she said. "It's taken a year and we've had our ups and downs, but we've never been in a better place than today, in fact."

Sia on Black Lives Matter

In addition to discussing motherhood, Sia also raised awareness of the tragic killings of two young Black lives: Breonna Taylor and Elijah McClain, both of whom died at the hands of police. At the time of their deaths, Taylor was 26 and McClain was 23.

The Black Lives Matter movement has repeatedly called for justice on behalf of Taylor and McClain. To do her part, Sia provided -- both on "GMA" and on Instagram -- actionable steps people can take to do just that.

During a separate chat with "GMA" on social media, the "Cheap Thrills" singer took a moment to acknowledge the impact Black culture has had on her life and entertainment as a whole.

"I can only assume that we'll be borrowing from Black culture for the rest of our existence," she added. "I listened to only Black music growing up, so I owe everything I have to Black culture."

Sia on Maddie Ziegler

Sia has also stepped into a new role in her career, having directed a musical film titled "Music" that she co-wrote with her best friend, Dallas Clayton.

The movie stars the nine-time Grammy nominee's longtime collaborator Maddie Ziegler, in addition to Kate Hudson and Leslie Odom Jr. from "Hamilton."

"OK, so the movie's great," Sia said of the film. "I'm going to break your heart, I'm going to put it back together again and you're going to love it."

As for the beginning of her friendship with Ziegler, 17, Sia said she watched the former "Dance Moms" star dance to "Chandelier" and "immediately started to cry."

The famed songwriter said she felt the need to protect Ziegler, who was just 11 at the time, because she was "suffering" from PTSD from the reality show. She detected this because PTSD was a part of her life, too.

"I recognized it in her and I just, I don't know what happened -- but the thought was, 'I have to protect her,'" Sia continued. "I knew she was going to be massively successful and that there would be so many opportunities for her to be taken advantage of."

Watch: Sia performs 'Bird Set Free' on 'GMA'

Watch: Sia performs 'Together' with Maddie Ziegler on 'GMA'