The 'Feel' singer glows in front of a bright green backdrop on stage at Wembley. This image appears in the gallery:The Summertime Ball 2013 Highlights - Pictures 5. The 'Feel' singer glows in front of a bright green backdrop on stage at Wembley. Picture: Derek Bremner 122 images See the full gallery: The Summertime Ball 2013 Highlights - Pictures