Omi singing his MASSIVE hit 'Cheerleader' to a more than welcoming Wembley. Catchy innit!

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One Direction, Ariana, Avicii & More! The MUST-SEE Pictures From Capital's Summertime Ball 2015

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See the full gallery: One Direction, Ariana, Avicii & More! The MUST-SEE Pictures From Capital's Summertime Ball 2015