Lawson's debut at the Summertime Ball 2012 saw them perform first single 'When She Was Mine'. This image appears in the gallery:Summertime Ball 2012: Backstage With Lawson 15. Lawson's debut at the Summertime Ball 2012 saw them perform first single 'When She Was Mine'. 15 images See the full gallery: Summertime Ball 2012: Backstage With Lawson