Semi-Final 4 - Results - S1.E12

Fourth-round voting results are revealed. Judges Brandy, David Hasselhoff and Piers Morgan offer their opinions on the act chosen by viewers to go to the finals. Also: the Hoff sings his new single, “Jump in My Car”; a performance from Cirque Du Soleil's “Zumanity”; and comedian Tom Green attempts to ride a skateboard through a ring of fire.