 During the night of the 2003 Grammy Awards , Perry forced Stefani into a chokehold , and demanded that they were " gonna write songs together ! " , to which Stefani reluctantly agreed . Soon after , Stefani finished the Rock Steady Tour with her band No Doubt , and took a call from her label , who informed her that Perry was in a studio ready to collaborate , and that Perry " only [ had ] five days out of the whole year to work with [ her ] . " Stefani has since admitted that she was frustrated by not being able to see her husband Gavin Rossdale , and was intimidated at the thought of collaboration , in particular with Perry , who she did not feel was qualified to write dance music . Stefani was exhausted by the recently completed tour , and shortly afterwards suffered an emotional breakdown , which she spent in bed crying . 
