Sigma were joined by Ella Henderson who slayed her performance of 'Glitterball' This image appears in the gallery:#CapitalJBB: MUST-See Sunday Pictures Including Justin Bieber, Ellie Goulding & More 67. Sigma were joined by Ella Henderson who slayed her performance of 'Glitterball' Picture: Gobinder Jhitta 81 images See the full gallery: #CapitalJBB: MUST-See Sunday Pictures Including Justin Bieber, Ellie Goulding & More