Jessie J grins at the 80,000 strong crowd for Capital's Summertime Ball. This image appears in the gallery:Jessie J At The Summertime Ball 2013 - Pictures 10. Jessie J grins at the 80,000 strong crowd for Capital's Summertime Ball. Picture: PA 20 images See the full gallery: Jessie J At The Summertime Ball 2013 - Pictures