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The Vamps & Shawn Mendes performing 'Oh Cecilia' live at the BBC Radio 1 Teen Awards 2014.

The Vamps and Shawn Mendes closed BBC Radio 1’s 2014 Teen Awards this past weekend with a performance of their latest single, 'Oh Cecilia'.

Brace yourself for the screams when Shawn joins 'em on-stage.

Watch the performance below…

P.S. Click HERE to check out our latest interview with The Vamps.