Gwen Stefani Debuts New Song 'Used to Love You' at New York Show: Watch

No Doubt performs on the opening day of Rock in Rio USA 2015 on May 8, 2015 in Las Vegas, Nevada.

No Doubt performs on the opening day of Rock in Rio USA 2015 on May 8, 2015 in Las Vegas, Nevada. 

Gwen Stefani surprised fans with a new song in New York City on Saturday, Oct. 17. The singer, who was on stage for a MasterCard Priceless Surprises concert at the Hammerstein Ballroom, premiered a track titled “Used to Love You.”

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“Used to Love You” is the first new music from Stefani since she confirmed the news of her split from Gavin Rossdale in August.

"I just want to share a song that I wrote recently," she said to the crowd before beginning the performance, according to People. "This song is really special."

Stefani sang the tune – with seemingly personal lyrics like “I thought I was the best thing that ever happened to you” and “I guess nobody taught you how to love” -- while a video featuring her own emotive facial expressions played on a big screen behind her.

 “Used to Love You” was reportedly produced by J.R. Rotem. On Twitter, Stefani revealed that it will be her new single.

Watch a live performance clip of “Used to Love You” below.