Jack and Cormac sing 'I Knew You Were Trouble' | Semi-Final 2 | Britain's Got Talent 2013

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Jack and Cormac sing 'I Knew You Were Trouble' | Semi-Final 2 | Britain's Got Talent 2013 with tags britain's got talent, britains got talent, britain's, got, talent, britains, bgt, 2013, ant and dec, ant, dec, simon cowell, david walliams, alesha dixon, amanda holden, jack, cormac, jack and cormac, irish, boy, singers, semifinals, live shows, tuesday

No trouble! Singing duo Jack and Cormac

The boy's bond is as strong as ever as they tackle Taylor Swift in the second semi-final.

Pushing nerves aside their rendition of I Knew You Were Trouble is a hit!