Gwen Stefani wowed fans with the debut of a new single during a concert in New York City on Saturday night. Called “Used to Love You,” there’s much speculation that the song is directed at her estranged husband Gavin Rossdale.

It was just this summer that Gwen Stefani announced that she and Rossdale were calling it quits following 13 years of marriage. They have three sons together.

“I just want to share a song that I wrote recently,” Gwen Stefani told Saturday night’s crowd before singing the emotional piece. “This song is really special.”

There's no doubt that @gwenstefani's new song is about Gavin Rossdale #UsedtoLoveYou http://t.co/Ymsd0s5546 pic.twitter.com/aIPqQQArnk

— POPSUGAR (@POPSUGAR) October 18, 2015

“I thought I was the best thing that ever happened to you” and “I guess nobody taught you how to love,” she sang.

In September, Gwen Stefani spoke with People magazine about her new music.

“[It’s] just truth,” she explained. “Just being clear and being true to myself. I just want to be fulfilled.”

Gwen Stefani has been one busy lady. Between recording new music, performing in concerts, serving as a coach on The Voice, and raising three boys, she likely has no time for herself.

The No Doubt front woman turned 46 on October 3rd–which no doubt leaves fans floored. She doesn’t look even remotely close to that age.

The new Don't Speak? @gwenstefani debuts new heartbreak song… It's AMAZING. Listen here: http://t.co/6I1YK7FENg pic.twitter.com/d3kPb2OXpM

— E! Online UK (@EOnlineUK) October 18, 2015

Do you love seeing Gwen Stefani alongside Blake Shelton, Adam Levine, and Pharrell Williams on The Voice?

Does word of this new single have you excited about hearing her new music? Is this new track the latest “Don’t Speak” from Gwen Stefani?