Days earlier on 6 May 1997 , Lawless inadvertently exposed a breast as she concluded a performance of the US national anthem at an NHL hockey game in Anaheim , California between the Mighty Ducks and Detroit Red Wings . Days earlier , on 6 May 1997 , Lawless had inadvertently exposed a breast as she concluded a performance of the US national anthem at an NHL hockey game in Anaheim , California between the Mighty Ducks and Detroit Red Wings .