Gwen Stefani debuted her new song "Used to Love You" at her solo show, during her MasterCard Priceless Surprises concert on Saturday at New York's Hammerstein Ballroom.

This is the first new track from the 46-year-old No Doubt singer since she announced her divorce from Gavin Rossdale in August. The song appears to be inspired by her split from her husband of 13 years, according to Rolling Stone.

"I just want to share a song that I wrote recently," Stefani told the crowd before launching into the emotional new ballad. "This song is really special."

Stefani sings on the chorus of the song, "I don't know why I cry / But I think it's cause I remember for the first time / Since I hated you / That I used to love you."

Additional lyrics in the song have Stefani singing, "There were no boundaries / But you just pushed me too far/ I guess nobody taught you / Nobody taught you how to love."

The new song was produced by J.R. Rotem. It follows the singer's latest solo singles "Baby Don't Lie," "Spark the Fire" and "Start a War," as well as a duet with Pharrell Williams titled "Shine."

Before her divorce, Stefani had announced collaborations with Williams, Charli XCX, Calvin Harris and Benny Blanco for her first solo album since 2006's "The Sweet Escape." A title has not been released yet for the upcoming LP.

"I'm shocked people still care," Stefani told Rolling Stone in December. "Doing another solo record and recording No Doubt music and being on 'The Voice' and having three boys all at one time, that just wasn't something I could dream up in my mind."

The singer has three children: 9-year-old Kingston, 6-year-old Zuma and 1-year-old Apollo. In her divorce petition, which she filed in August, Stefani cited "irreconcilable differences" and asked for joint custody of the children.