Photo of Gwen Stefani performing at Rock in Rio USA 2015, by Christopher Polk

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Gwen Stefani on Saturday debuted an emotional new track live for fans at New York's Hammerstein Ballroom.

Titled "Used to Love You," it marks the singer's first material since her split from longtime husband Gavin Rossdale. And she described it to the audience as something "really special" to her.

Stefani has since confirmed the track will be her next official single.

Watch fan footage of the performance below.