KSI was left in floods of tears during Britain's Got Talent . The judge who found fame on YouTube opened up about his own heartbreak as a "magical" performance came to an end. Tonight, the fourth semi-final of the ITV show aired, two weeks before the finalists will battle it out for a spot on the Royal Variety Performance bill. But Sonny Green left KSI emotional after the poet took to the stage to share a tear-jerking insight into his relationship with his sons, who unexpectedly appeared