"Boyfriend" was on the RIANZ Top 40 Singles chart in New Zealand from November 2005 to January 2006. The song debuted at #23 in early November, where it remained in its second week, before rising to #21 in its third week. It then fell to number 30 before rising back to number 26 in its fifth week. In its sixth week it fell again to number 37, and was then off the chart for two weeks before returning at number 40; subsequently it fell off the chart again for one week and then returned at number 37 for its eighth and final week on the chart.