David Guetta hits the #CapitalSTB stage to close the show This image appears in the gallery:Summertime Ball 2014: The MUST-SEE Pictures From Our BIGGEST Ball Ever 21. David Guetta hits the #CapitalSTB stage to close the show Picture: Derek Bremner 148 images See the full gallery: Summertime Ball 2014: The MUST-SEE Pictures From Our BIGGEST Ball Ever