The lyrics are undoubtedly personal to the No Doubt frontwoman, who filed for divorce from husband Gavin Rossdale in August after nearly 12 years of marriage. In her divorce petition, Stefani cited "irreconcilable differences" and asked for joint custody of the couple's three children: Kingston, 9; Zuma, 6; and Apollo, 1.
Prior to Saturday's concert, Stefani spoke to ET about how music has helped her through the breakup.
"The biggest gift has been to be able to take some tragedy and write a song about it and share that," Stefani said. "The rewards that I've gotten through that is just unbelievable."