Singer Gwen Stefani is pouring her heart into new music in the wake of her split from Gavin Rossdale.<br />The singer, 46, debuted her emotional upcoming single "Used to Love You" during her MasterCard Priceless Surprises concert in New York City, reported People magazine.<br />"I just want to share a song that I wrote recently," Stefani told fans before singing the powerful number.<br />Stefani belted out her personal lyrics.<br />“I thought I was the best thing that ever happened to you and I guess nobody taught you how to love.”<br />Stefani and Rossdale, parents to Kingston, nine, Zuma, seven, and Apollo, 19 months recently announced their divorce in August after 20 years together and nearly 13 years of marriage.
