Omi singing his MASSIVE hit 'Cheerleader' to a more than welcoming Wembley. Catchy innit! This image appears in the gallery:One Direction, Ariana, Avicii & More! The MUST-SEE Pictures From Capital's Summertime Ball 2015 135. Omi singing his MASSIVE hit 'Cheerleader' to a more than welcoming Wembley. Catchy innit! Picture: Joe Okpako 171 images See the full gallery: One Direction, Ariana, Avicii & More! The MUST-SEE Pictures From Capital's Summertime Ball 2015