Stefani debuts emotional song after splitNew York, Oct 18 (AZINS) Singer Gwen Stefani has poured her heart into new music in the wake of her split from husband Gavin Rossdale.

The singer, 46, debuted her emotional single "Used to love you" during her concert here on Saturday, reports people.com.

"I just want to share a song that I wrote recently," Stefani told fans before singing the powerful number. "This song is really special."

As Stefani belted out her personal lyrics, including "I thought I was the best thing that ever happened to you" and "I guess nobody taught you how to love," an intimate clip of her played in the background.

Stefani and Rossdale - parents to Kingston, 9, Zuma, 7, and Apollo, 19 months - announced their divorce in August after 20 years together and nearly 13 years of marriage.